refactoring constructor quadedge
quad edge constructor
vestigal structures
Subdivision constructor
copy point values instead of reassigning pointers
use . instead of ->
Some simplifications
reorganizing. Trying to find a bug in quadEdge_create();
trying to fix segmentation fault
Merge branch 'memoryManagement'

Conflicts:
	src/Delaunay.c
	src/QuadEdge.c
	src/Subdivision.c