Simplify regex_timer to eliminate regression failure.
Rename extern "C" function to have a "boost_" prefix.
Fix recursive-expression related bug, and update tests to match.
[SVN r58885]
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]
