Periodic BC in distributed grid

added 34 commits

• 8bb6dc08...b6120d30 - 16 commits from branch develop
• c94e1a02 - Fixed cmake RUNPATH error.
• 4ca5c976 - Fixed const cast in MPI calls.
• d437af27 - Added new constructor and distributed node ID to FileName.
• ad50cfaf - Fixing templated constructor of String, make it explicit + other fixes in String.
• 7ba034e7 - Fixed comment of --mpi-process-to-attach parameter in MpiCommunicator.
• 45531d5e - Small fixes of Logger.
• c615ee12 - Fix of FileName constructor.
• dcb58e82 - Fixes ListTest and adde comment ti templated String constructor.
• ab0345c8 - Added parameter tag to Communicator::ISend and Communicator::IRecv.
• 5fc2b3ed - Added specialization of MeshFunctionGnuplotWriter for grids.
• 25081b90 - Fixed setup method of distributed grid.
• 48a064a1 - Fixed DistributedMesh setup call in Time(In)dependentPDESolver.
• 2e211e16 - Added new constructor and distributed node ID to FileName.
• 39e39b13 - Fixed synchronization of periodic boundary conditions with two MPI processes.
• 0563fecf - Fixed templated String constructor and added constructor from bool.
• d935dac0 - Revert "Fixed cmake RUNPATH error."
• 23d4e080 - Fixed DistributedSpMV: added new tag parameter
• c060e1fd - Added operator<< for Subrange formatting

Compare with previous version

I can say nothing to Discusions about String. @klinkovsky may ask @oberhuber in school to speed up this process.

resolved all discussions

mentioned in issue #18 (closed)

merged

mentioned in commit abcae81d