SyncModel to force transfer from old GEO db to GModel

getPhysicalNumber(const int &dim, const std::string & name)

A possible fix to crash in

#0  0x0296dab6 in std::_Rb_tree_increment ()
#1  0x002762b3 in std::_Rb_tree_const_iterator<Cell*>::operator++ () at stl_tree.h:351
#2  0x002762b3 in CellComplex::reduction (this=0x1a854d80, dim=2) at CellComplex.cpp:351

ported Triangulate plugin to new API

ported Skin plugin to the new API

dimensions.

fix STL export of quads

call setVolumePositive() in all ::writeXXX() functions