make_date_seq: Create a sequence of dates
In jameslairdsmith/contractr: contractr is a grammar of financial contracts.

It is often the case that one needs to create a series of dates using only the start, end and freqency.

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make_date_seq(start_date, end_date, period_gap, tolerance = 0.2,
  include_first = T, include_last = T, replace_last = F,
  allow_last_jump = F)

`start_date`	The start date
`end_date`	The end date
`period_gap`	The period gap
`tolerance`	the tolerance
`include_first`	whether to include the first date
`include_last`	whether to include the last date
`replace_last`	whether to replace the last date with `end_date`