remove acmake submodule, prepare to use subtree
Squashed 'acmake/' content from commit d6d436b

git-subtree-dir: acmake
git-subtree-split: d6d436b8ffb327057848b2e44122421fd6c2634e
Merge commit '4bb2bb5048a8ca0925750f7aedeb571bf62c20af' as 'acmake'
change cmake version require
C++11 compiler flags under linux
C++11 compiler flags under linux
boost pp ctor of shared tested