rSFSW2: Simulation Framework for SOILWAT2

Add/multiply deltas to historic daily precipitation to generate future daily precipitation without checks

applyPPTdelta_simple(
  m,
  data,
  ydelta,
  add_days,
  mult_days,
  set_negPPT_to0 = TRUE
)

`m`	An integer vector. Each element corresponds to a day (i.e., `length(m)` is 365 or 366 days) and the values are the number of the month.
`data`	A numeric vector. Precipitation of each day.
`ydelta`	A numeric vector. Delta values for each day. If computed deltas are monthly, then they must be repeated for each day before passed as argument to this function.
`add_days`	A logical vector. `TRUE` for each day for which `ydelta` is applied additively.
`mult_days`	A logical vector. `TRUE` for each day for which `ydelta` is applied multiplicatively.
`set_negPPT_to0`	A logical value. If `TRUE` (default) then force days with resulting negative values of precipitation to 0 – thereby introducing a positive bias.