#' @title
#' Functionality for handling package libraries
#'
#' @description
#' The package provides useful functionality with respect to
#' packages and package libraries.
#'
#' @section Library-related functions/methods:
#'
#' \itemize{
#' \item{\code{\link[libr]{compressLibrary}}: }{
#'
#' Compresses a package library so it can be backed up or transferred.
#' }
#' \item{\code{\link[libr]{deleteLibrary}}: }{
#'
#' Deletes a package library. Mainly designed when working with
#' multiple libraries for systematic testing/sandboxing purposes
#' (e.g. testing new package versions in a own "fresh" library which
#' is deleted again if everything went according to plan).
#' }
#' \item{\code{\link[libr]{ensureLatestPackageVersions}}: }{
#'
#' Ensure that latest package versions are installed. Currently,
#' this is mainly targeted at self-developed packages rather than
#' packages contributed by other developers.
#' }
#' }
#'
#' @section Package-related functions/methods:
#'
#' \itemize{
#' \item{\code{\link[libr]{asPackage}}: }{
#'
#' Complements the functionality of \code{\link[devtools]{as.package}}.
#' Input can also be the name of a loaded or installed package.
#' }
#' \item{\code{\link[libr]{unloadPackage}}: }{
#'
#' Complements the functionality of \code{\link[devtools]{unload}}
#' by combining it with \code{\link[libr]{asPackage}}.
#' }
#' }
#'
#' @section Convenience functions/methods:
#'
#' \itemize{
#' \item{\code{\link[libr]{isLibrary}}: }{
#'
#' Checks if a certain directory path corresponds to a package library.
#' }
#' \item{\code{\link[libr]{isPackageInstalled}}: }{
#'
#' Checks if package is installed in a specific package library.
#' }
#' \item{\code{\link[libr]{isPackageLoaded}}: }{
#'
#' Checks if package is loaded (attached to search path).
#' }
#' }
#'
#' @template author
#' @template references
#' @docType package
#' @name libr
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