GitLab

Added GridGen – simple parallel mesh generator
Added FVDiscr – simple two-point FVM scheme

Added MPI_Allreduce wrapper with MPI_MAX operation.

Retrieval of elements by markers;
Introduced options for loading of files;
Fixed issues saving vtk format when not all topological tests are
active;
Introduced Connect / Disconnect functions for manipulations with mesh;
DrawGrid example can now visualize array of entered cells/faces for
debug purposes;
OldDrawGrid example demonstrates fast interactive mesh slicing and
onscreen element picking.

Attempt to get rid of undefined reference error for static const class
variable on gcc compiler

Fix crush - not properly freeing communicators.

Added doxygen-style comments to common, partitione and solver headers

Initial test of doxygen documentation tool

Added Documentation directory with initial doxygen configuration file

some changes