calcMonthly: calcMonthly
In Pacific-salmon-assess/eramonth: domestic ERA tools

Calculate monthly distribution of tag recoveries for custom fishery groupings (loops through all stocks in the CAS input file).

calcMonthly(
  fmap = NULL,
  pathdb = NULL,
  cas = NULL,
  tracing = FALSE,
  infill = TRUE
)

`fmap`	= data frame that matches 195 CAS fishery ids (CFILENO) in col 1 to a lookup grouping in col 2. Lookup groupings are used as output labels.
`pathdb`	= text string with path to the CAS database (need either this or the cas input below)
`cas`	= data frame with CAS data, generated from database (need either this or the pathdb input above)
`tracing`	= if TRUE, print various summaries
`infill`	= if TRUE, include months with 0 recoveries