make scalar genmask branch-free for all cases
adding BOOST_FORCEINLINE to several shuffling functions
add optional BOOST_SIMD_BRANCH_FREE_IF_ELSE macro to make if_else use bitwise_select in scalar mode too
add option to say that a module is 'experimental', in which case it doesn't get loaded by default by FindNT2
HPX support is experimental
use ast_ instead of expr_ for inner_fold and outer_fold, fix matching of simd version
fix issue #658, add nt2/sdk/functor/site.hpp header to include to ensure all the best site has been set. Included by nt2/include/functor.hpp so is pretty much always included first in NT2.
ignoring site in graph scripts until we parse it
use ptr+new to test constructors in of_size test to address new NT2_TEST_ASSERT macro implementation