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

too hard to maintain

added createtopologyFromMSH to create Topology from list of triangles

* point not found should NOT be an error in the octree

HAVE_XXX defines.

This fixes three longstanding problems:

- the API was hard to use because some headers had HAVE_XXX ifdefs, so
  that cient codes had to know how the lib was compiled to compile
  themselves

- we had to do make clean after each ./configure, which erased too
  much (e.g. most of contrib)

- make depend could include unwanted stuff since it redefined FLAGS

- fix bb computation to avoid model jumping around when adding points in z=0 plane
- pass interpol matrices as ref

move integration routines to Numeric/

reparametrization through harmonic maps enhanced

consolidate parametricCoordinates with reparamMeshVertexOnFace

- fixed missing getShapeFunction/getGradShapeFunction + return all sf
  at once so we can implement MElement in term of these consistently
  (w or w/o FunctionSpace)

- can now merge multiple meshes and remove duplicate mesh vertices
  (useful e.g. when merging several STLs)

- added easy interface to create model-based postpro datasets on the
  fly + use this for mesh quality stats

redefinition of local curvature as the max in 2 directions

bug fix: orientation of face vertices of 4th order tetrahedra