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

   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

  did in high
* added mesh generation error log summary
* removed Parallel subdir (this is now handled by the message class)
* removed Box subdir and consolidated batch processing in a single
  routine
* made List_T into a class
* reduced dependencies in Pview*.h so we can eventually add the post-pro
  interface to the public API

untabify

removed vestiges of "discrete point" hack in gmshVertex & co (now that
we have the correct discreteXXX classes)

bbox drawing of geo entities for debug (disabled)

API cleanup: FVertex, FEdge, etc. -> fourierVertex, fourierEdge, etc.

new boundary layer mesh generator

refactored smooth value/smooth normal code into single SmoothData.* file

fixed interpolation of ruled surfaces created by extrusion

fixed interpolation of trimmed ruled surfaces