Improved error messages generated for thrown exceptions.

Suppressed "gcc -Wall -Wextra -pedantic" and "msvc /W4" warnings.
Updated and rebuilt docs.


[SVN r57451]

libs/regex

@@ -1 +1 @@
-Subproject commit 898b49fa89e1964d61536fdbb5955a95555d7636
+Subproject commit 6e1f3dccebaa3697eff017dcd7ccd5e42840b1f6