Merge from trunk:
* dropped support of antique compilers
* fixed issue with ambiguity in swap (fixes #2839)
* added conditional noexcepts to move assignments, default and move constructors (fixes #7911)
* experimental variadic templates support (refs #9163)
* bunch of size optimizations for assignments and move assignments (refs #7960)
* minor changes and size optimizations

[SVN r86650]