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Need to discuss this:

     OPAL> * intersectTinyLineSegmentBoundary:  WARNING: pt=( 0.00017769 , -8.1542e-05 , 0.00086429 )  is outside the bbox  i=-7  j=176  k=0


The only boundary geometry MUST be at the first element !

I moved this call out of the scope where node0 is writing to a file.

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NOW CSR and SPACE charge are working in parallel but ONLY
if all dimensions are distributed. This is not understood !
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- bugfix in orienting the triangles: the STL set-intersection doesn't work
  as expected with unordered sets.
- multi-parted meshes are now supported (but not yet tested)
- several variables and methods refactored to improve readability.

BoundaryGeometry: fastIsInside(): return 1 without further tests if point is outside bbox, pass args as reference; all functions: use gsl_fcmp() to compare floating point numbers

BoundaryGeometry: pass args by reference in intersection tests; in intersectRayBoundary(): use a box which is smaller than the voxel mesh but largen than bbox of the geometry for computing the intersection with the bbox of the geometry; print a warning, if mapPoint2VoxelIndices() is called for a point outside the bbox of the voxel mesh

BoundaryGeometry: bugfix in counting intersections in intersectTinyLineSegmentBoundary(). This actually fixes an issue wih fastIsInside(); Faster mesh voxelization.

BoundaryGeometry: private method intersectTinyLineSegmentBoundary() for testing small line segments added; this is the core method used by all line-segment/ray triangle intersection testing, including fastIsInside() and PartInside()

BoundaryGeometry: private method intersectLineSegmentBoundary4PartInside() removed; private method intersectTinyLineSegmentBoundary() for testing small line segments added

Bugfix in fastIsInside (v was pointing in wrong direction), temporary use of intersectLineSegmentBoundary instead of intersectLineSegmentBoundary4PartInside. Pending Achims approval. -DW

BoundaryGeometry: bugfix in intersectLineSegmentBoundary(): the case where the ray starts close to the boundary but away from it was handled wrong