Function: whatnow
Class: gp
Section: programming/specific
C-Name: whatnow0
Prototype: vr
Help: whatnow(key): if key was present in GP version 1.39.15 or lower, gives
 the new function name.
Description:
 (str):void             whatnow($1, 0)
Doc: if keyword \var{key} is the name of a function that was present in GP
 version 1.39.15 or lower, outputs the new function name and syntax, if it
 changed at all ($387$ out of $560$ did).