dynamic_bitset: * fixed form of some remaining copyright lines * using namespace detail::dynamic_bitset_impl for *all* implementation details (dynamic_bitset_*count*_impl removed) and consequently shortened some entity names * switched from enum to bools for "enum mode", to help several compilers which show problems with recognizing access_by_bytes and access_by_blocks as constant expressions * minor comment changes * implemented the do-the-right-thing dispatch for constructor from iterator-range, a la standard sequence containers (feature request #2172) * dropped now useless comparison with zero in reference constructor
NOTE: updated tests and documentation not committed yet; let's wait for the trunk results first