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Fixed major bug for Merge Shrink with Single strat. Both cannot be applied together. Is a different bug from the previous commit

Added names for setting data in MaM. Valgrind related bugfixes. Bugfix when sending size_t variables.

Improved strat wait_targets so it only performs a single Ibarrier for all asynch redistribution. Added function to check config is valid before starting reconfiguration

Added new header file (mam.h) for public usage. New file for internal configuration of methods. Reduced arguments in internal functions. WIP