Branch for adding initializer list support (only in the unreleased gcc 4.4 at the moment).

SVN-Revision: 48931
Add tests for BOOST_NO_INITIALIZER_LISTS. Refs #2332

SVN-Revision: 48939
Add the BOOST_NO_INITIALIZER_LISTS configuration to the compiler configuration files. Regs #2332

SVN-Revision: 48948
Ralf's mpl patches for gcc 4.4. Needed to be able to test initializer list support.

SVN-Revision: 48949
Add initializer list support to unordered containers, still needs documentation and more tests.

SVN-Revision: 48950
Merge from trunk to make sure I don't accidentally merge the accidental initialize-list commit and rollback.

SVN-Revision: 48952