latest (still some problems with graham scan)
Merge branch 'master' into dev
Latest Robust Convex Hull (forgot to switch to double precision only (not extended precision!)  this is needed in Shewchuck's code -> added Floating Point switches xpfpa.h and Rounding.hpp   which is used in Predicate.cpp that way also my errors disappeared in the convex hull which were only due to the lack of imprecision!
Merge branch 'dev'