move forward
various updates:
 - fixes #238 add nt2 as submodule of feelpp¢ontrib (optional) + add test_nt2 in testsuite/feelcore
 - fixes #435 if nt2 is used then automatically the simd configuration is done
 - create tools and move scripts/ in tools. @vhuber you will need to update the
 cron job for doxygen (publish.sh)
use ensightgold
Merge branch 'develop' of https://github.com/feelpp/feelpp into develop

Conflicts:
	cmake/modules/FindFeel++.cmake
move submodule forward