When turning on the following flags, several additional warnings
were generated, which have been cleaned up in this patch. The
flags included:
-Wextra
-Wpedantic
-Wconversion
-Wsign-conversion
-Wctor-dtor-privacy
-Wshadow
-Wnon-virtual-dtor
-Wold-style-cast
-Wcast-align
-Woverloaded-virtual
* Make BoundsRanges<dynamic_range, ...>::m_bound non-const and private
* Remove various defaulted copy constructor/assignment declarations from BoundsRanges specializations whose only effect is to needlessly suppress the generation of moves
* Remove the hackish static_bounds::operator=(const static_bounds&). The implicitly generated default is now sufficient
