Implement Matlab binary format as suggested by Milan Hanus.

Conflicts:
	hermes_common/include/matrix.h
Progress on DoubleMachReflectionAdapt.
Merge branch 'devel' of github.com:l-korous/hermes into devel
Some reorganization of NeighborSearch code.
Work on Euler test examples structure.
Finish Euler reorganization.
Fix paths and use Feistauer's limiter in double reflection.
Fix and use Feistauer limiter.
Fix Feistauer limiter.
Debugging Feistauer.
Progress on limiting.
Make Feistauer have more limiting choices.
Fix and use massive Feistauer limiting.
Work on the Feistauer's limiter.
Add a new mesh for shock tube problem.
Work on shock tube.
Fix create_limiter().
Add GAMM channel for Feist-Vertex comparison.
Add triangular mesh.
Fixes in Postprocessing, Euler.