Revert "Force map. Later it may be reverted"

This reverts commit 727c4f8b343aca0a8a87d06961a082814ebbd8b1.
Merge branch 'master' into optimized
Add benchmark function
Fix using floating point
Fix indentation
Fix bench function
Fix flags
Test 512
Don't throw away debug log call
Don't allocate backing stone until it is needed
Zero copy pushbuf in most cases.
Add comment about zero copy pushbuf