deprecate chunkerfuncuni and chunkerfunclocal

[askhamwhat]

name's too long, doesn't do much new?

perhaps a slight modification of the chunkerfunc interface:

chunkerfunc(fcurve,cparams,pref,ts)

where ts is a nch+1 array specifying the end points of the desired chunks in the array. If ts is provided, then no adaptivity is done. this would also be useful for RCIP