Crated a branch for the new IO code for Boost.DateTime.

SVN-Revision: 62584
Preliminary changes and the initial version of the spirit-based formatter.

SVN-Revision: 62591
Merged recent changes from trunk.

SVN-Revision: 62850
Added support for facet-based formatting. Implemented a locale-based character code conversion and deprecated the old one.

SVN-Revision: 62928