plu: Dynamically Pluralize Phrases

#' @details # Copyright
#'
#' **plu** uses data from the
#' **Automatically Generated Inflection Database (AGID)**, which is released
#' under the following license:
#'
#' The final product is under the following copyright, as well as any
#' copyrights mentioned below.
#'
#' Copyright 2000-2014 by Kevin Atkinson
#'
#' Permission to use, copy, modify, distribute and sell this database,
#' the associated scripts, the output created form the scripts and its
#' documentation for any purpose is hereby granted without fee,
#' provided that the above copyright notice appears in all copies and
#' that both that copyright notice and this permission notice appear in
#' supporting documentation. Kevin Atkinson makes no representations
#' about the suitability of this array for any purpose. It is provided
#' "as is" without express or implied warranty.
#'
#' The part-of-speech database is taken from Alan Beale 2of12id
#' and the WordNet database which is under the following copyright:
#'
#' This software and database is being provided to you, the LICENSEE, by
#' Princeton University under the following license.  By obtaining, using
#' and/or copying this software and database, you agree that you have
#' read, understood, and will comply with these terms and conditions.:
#'
#' Permission to use, copy, modify and distribute this software and
#' database and its documentation for any purpose and without fee or
#' royalty is hereby granted, provided that you agree to comply with
#' the following copyright notice and statements, including the disclaimer,
#' and that the same appear on ALL copies of the software, database and
#' documentation, including modifications that you make for internal
#' use or for distribution.
#'
#' WordNet 1.6 Copyright 1997 by Princeton University.  All rights reserved.
#'
#' THIS SOFTWARE AND DATABASE IS PROVIDED "AS IS" AND PRINCETON
#' UNIVERSITY MAKES NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR
#' IMPLIED.  BY WAY OF EXAMPLE, BUT NOT LIMITATION, PRINCETON
#' UNIVERSITY MAKES NO REPRESENTATIONS OR WARRANTIES OF MERCHANT-
#' ABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE OR THAT THE USE
#' OF THE LICENSED SOFTWARE, DATABASE OR DOCUMENTATION WILL NOT
#' INFRINGE ANY THIRD PARTY PATENTS, COPYRIGHTS, TRADEMARKS OR
#' OTHER RIGHTS.
#'
#' The name of Princeton University or Princeton may not be used in
#' advertising or publicity pertaining to distribution of the software
#' and/or database.  Title to copyright in this software, database and
#' any associated documentation shall at all times remain with
#' Princeton University and LICENSEE agrees to preserve same.
#'
#' Alan Beale 2of12id.txt is indirectly derived from the Moby part-of-speech
#' database and the WordNet database.  The Moby part-of-speech is in the
#' public domain:
#'
#' The Moby lexicon project is complete and has
#' been place into the public domain. Use, sell,
#' rework, excerpt and use in any way on any platform.
#'
#' Placing this material on internal or public servers is
#' also encouraged. The compiler is not aware of any
#' export restrictions so freely distribute world-wide.
#'
#' You can verify the public domain status by contacting
#'
#' Grady Ward
#' 3449 Martha Ct.
#' Arcata, CA  95521-4884
#'
#' grady@netcom.com
#' grady@northcoast.com
#'
#' The word list used is a combination of several word list:
#'
#' 1) The ENABLE2K word lists which is in the public domain:
#'
#'    The ENABLE master word list, WORD.LST, is herewith formally
#'    released into the Public Domain. Anyone is free to use it or
#'    distribute it in any manner they see fit. No fee or registration
#'    is required for its use nor are "contributions" solicited (if you
#'    feel you absolutely must contribute something for your own peace
#'    of mind, the authors of the ENABLE list ask that you make a
#'    donation on their behalf to your favorite charity). This word
#'    list is our gift to the Scrabble community, as an alternate to
#'    "official" word lists. Game designers may feel free to
#'    incorporate the WORD.LST into their games. Please mention the
#'    source and credit us as originators of the list. Note that if
#'    you, as a game designer, use the WORD.LST in your product, you
#'    may still copyright and protect your product, but you may *not*
#'    legally copyright or in any way restrict redistribution of the
#'    WORD.LST portion of your product. This *may* under law restrict
#'    your rights to restrict your users' rights, but that is only
#'    fair.
#'
#' 2) All of the word lists except ABLE.LST in the ENABLE2K Supplemnt
#'    which consists of:
#'
#'      2DICTS.LST
#'      ALSO.LST
#'      LETTERS.LST
#'      OSPDADD.LST
#'      UCACR.LST
#'      LCACR.LST
#'      NOPOS.LST
#'      PLURALS.LST
#'      UPPER.LST
#'
#'    All of these word lists are also in the public domain.
#'
#' 3) The list of signature words from the YAWL package which is in the
#'    public domain.
#'
#' 4) The UK Advanced Cryptics Dictionary which in under the following
#'    copyright:
#'
#'      Copyright (c) J Ross Beresford 1993-1999. All Rights Reserved.
#'
#'      The following restriction is placed on the use of this
#'      publication: if The UK Advanced Cryptics Dictionary is used
#'      in a software package or redistributed in any form, the
#'      copyright notice must be prominently displayed and the text
#'      of this document must be included verbatim.
#'
#'      There are no other restrictions: I would like to see the
#'      list distributed as widely as possible.
#'
#' 5) Some extra words found in the Part-Of-Speech database that was not
#'    found in any of the above word lists.
#'
#' 6) Words found in the Jargon File Word List package, available at
#'    http://aspell.sourceforge.net/wl/, which is in the Public Domain.
#'
#' 7) Words in 2of12id.txt not in any of the word lists above.  2of12id is
#'    indirectly derived from all the above sources and most of the word
#'    lists from the Moby Words package:
#'
#'      10196pla.ces
#'      113809of.fic
#'      21986na.mes
#'      256772co.mpo
#'      354984si.ngl
#'      3897male.nam
#'      4160offi.cia
#'      4946fema.len
#'      6213acro.nym
#'      74550com.mon
#'
#'    The Moby Word package, like the Part-Of-Speech database is in the
#'    public domain.
#'
#' 8) And finally some extra words that I added myself.  These words can be
#'    found in the file "extra-words"
#'
#' @keywords internal
"_PACKAGE"

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