Use CMAKE_CXX_STANDARD to require c++14, depend on CMake 3.1.3
Use CMAKE_CXX_STANDARD to require c++14, depend on CMake 3.1.3

live-clones/netgen,live-clones/netgen,live-clones/netgen,looooo/netgen,looooo/netgen,live-clones/netgen,looooo/netgen,live-clones/netgen,looooo/netgen,looooo/netgen,looooo/netgen,live-clones/netgen