Memaccess stats

Here it is, to count the pruned tasks

added 10 commits

• bbf83f28...bed75474 - 3 commits from branch solverstack:master
• 6745049c - Allow runtimes to have their own memory access macros
• afa472de - Add begin/end memory access hooks for runtimes
• 9cfedae6 - typo
• e5d8288c - Add execution rank parameter to MORSE_RANK_CHANGED
• d1f7a467 - Also add RANK_CHANGED callback for runtimes
• afbd9e49 - Add do/while to fix usage in if blocks
• 2f441bb8 - Adding pruning stats on top of memaccess

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added 1 commit

• 169b5687 - fix build without pruning stats

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resolved all discussions

merged

mentioned in commit c8208da5