added createTopology when Merging a MSH File and implemented discreteEdge

setNum() should change _globalNum

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

consolidate parametricCoordinates with reparamMeshVertexOnFace

cleanup high order

   1) this removes the asymmetry in all the routines involving mesh
      elements associated with points

   2) it makes it possible to use point-based datasets in the
      model-based post-processing module

  **********************************************************
    PLEASE TEST --- ESPECIALLY THE INPUT/OUTPUT ROUTINES!
  **********************************************************

* made GModel::getEntities() more efficient and generalized its use

CGNS I/O rewrite - alpha version

- removed every "throw;", i.e., every throw that did not throw an actual exception.
  throw wihout args should ONLY be used in a catch{} to re-throw the same exception
  (for it to be handled in another catch clause)

- introduced GmshMessage callback class so that clients can easily implement
  their own message handling (see example in driverOCC.cpp)

* implemented first rough draft of VTK mesh writer

******************************
*   WARNING - PLEASE TEST    *
******************************

- changed I/O so that we NEVER change vertex number ids once a mesh has
been generated (or loaded)

- removed dataIndex from MVertex: stepData in PVewDataGModel now directly
uses the vertex/element number ids. This can lead to increased memory
use in corner cases (for which PViewDataList works fine, so it's not a
big deal), but it is simpler and faster

untabify

introduce notion of entities in PViewData (in prepa for gmodel stuff)

- clean up GModel API (xxByTag -> getXx, numXx -> getNumXxes, ...)

	-) A bug has been corrected in the MeshAdapt Procedure
	-) The 2D Delaunay is now Anisotropic
	-) 3D Sliver removal procedure has been improved
	-) Curvilinear mesh generation has been slightly improved,
	   even if it is still far from done
JFR

fix BDF small field export on Windows (apparently Windows does not conform
to ANSI C and uses 3 digits in %e instead of 2)

cleanup previous commit + move "carve hole" routines in separate file

cleaned last gcc warnings

tagging gmsh_2_0_0

- subclassing higher order vertices is not a good idea--it makes the
identification hard in the I/O layer. So let's just store a char for
the order like we did in the old versions

- fixed license.texi and in License.cpp

- removed unused GEntity::inClosure()

- nicer display of second order elements (don't draw internal edges)
- nicer display of second order vertices (color like in 1.65)