- Fixed warnings "may be uninitialized" for distmem mirror entries.
 - Added setting for minimum number of elements per node.
 - Added distributed memory heap manager distmemphm. Removed
SAC_DISTMEM_Malloc and SAC_DISTMEM_seg_free_offs. Hopefully fixed
diagnostic heap manager total memory.
 - Solved bug: only enter side effects execution mode once.
 - Only use barriers between broadcast phases if there is something to
broadcast.
 - Improved detection of functions with side-effects.
 - Added exit code to libsacdistmem.
 - Moved logging of broadcasts to libsacdistmem.
 - Improved tracing, some refactoring and documentation.
 - Tried to improve detection of distributable arrays.
 - Now we are dealing with all possible inout/out arguments of functions
with side effects.
 - Nested with-loops with sub-allocs should work.