MPI: refactoring of DistributedGridSynchronizer

See merge request !21

Vít Hanousek authored Nov 22, 2018 and Jakub Klinkovský committed Jan 25, 2019

	- added compatibility code for periodic-BC
	- this part of code needs discusion if work corectly

Vít Hanousek authored Nov 22, 2018 and Jakub Klinkovský committed Jan 25, 2019

	Issue #15 working basic synchronizer
	-Periodic BC doesnt work

Vít Hanousek authored Nov 22, 2018 and Jakub Klinkovský committed Jan 25, 2019

 have same sizes at standard communication.
 -distributedGridSynchronizer was moved.

Vít Hanousek authored Nov 21, 2018 and Jakub Klinkovský committed Jan 25, 2019

	- without PeriodicBC implementation
	- SubdomainOverlapGetter has changed interface
	 -> need more updates, only basic grid tests work

Vít Hanousek authored Nov 21, 2018 and Jakub Klinkovský committed Jan 25, 2019

bad interpretation of lower and upper overlap.

Vít Hanousek authored Nov 21, 2018 and Jakub Klinkovský committed Jan 25, 2019

   -rename directions to ZvYvXv, where v is m,z,p
   -correct y direction in 2D

Nina

See merge request !19

fixes #13