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  grids.
* Now both inter{p|pp}.{old|new} print warnings and divert to inter{p|pp}.
* ACM 761 code updated to the revised version by Renka and Brown from 1998.
* Fixed two array overruns in ACM 761 code (work array size increased,
  thin triangle removing step cancelled if necessary).
* Thin triangle removing can now be omitted by paramater remove=FALSE
  (this is default for linear interpolation).

* declare interp.new and interp.old deprecated

* old Akima code removed
* interp.old removed
* interp and interp.new merged
* similar for interpp
* a bilinear interpolation fro rectangular grids added (also gridwise in bilinear.grid)
* new ACM license url

drop ncp parameter

works also with crosslinking aklima against tripack (R-genlibs patch at
ftp://ftp-stat.uni.klu.ac.at/pub/R/contrib). In this case src/tripack.f
can be removed.

interp() chooses now between old an new version of code