[Rd] Citation if copying R base code

[Peter Meissner]

Thank you all for your advise, comments and suggestions.


To keep it simple and play it fair and save, I choose to take the 
following actions:


Within DESCRIPTION

- the License now reads:
License: GPL (>= 2)

- the Authors are specified as
Authors at R: as.person(c(
     "Peter Meissner <retep.meissner at gmail.com> [aut, cre]",
     "R Core team [ctb] (wp_date() derived from base package as.Date())"
     ))


Also, the wp_date() help files mention where I copied and where I did 
rewrite code. I hope that's fine and good for everyone.



Puh. - That's it.

Best, Peter