Re-ordered code in static_mutex.hpp to satisfy SGI IRIX.
Added some additional #includes to satisfy SGI Irix.
Fixed strange bug where some non-greedy repeats could repeat more times than permitted.
Fixed return value from basic_regex<>::empty().
Fixed return value from basic_regex<>::expression() and basic_regex<>::size() when the expression is invalid.
[SVN r30604]
2) Changed std::copy calls on VC8 to avoid "dangerous code" warnings.
3) Moved backreference and octal escape code into line with POSIX-extended requirements.
4) Changed match_results leftmost-longest rules to stop unnecessary std::distance computations (an optimisation for non-random access iterators).
5) Changed C lib calls to use "safe" versions of string API's where available.
6) Added many new POSIX-extended leftmost-longest tests, to verify the above.
[SVN r27880]
