Bug fixes and documentation updates.

svn path=/sandbox/boost/variant.hpp; revision=697
Variant assignment bug fix.

svn path=/sandbox/boost/variant.hpp; revision=713
Added test for fixed assignment bug.

svn path=/sandbox/libs/variant/; revision=716
MPL preprocessed header workaround.

svn path=/sandbox/boost/variant.hpp; revision=717
1) most of the stuff moved to other .html files
2) New TOC + Introdcution

svn path=/sandbox/libs/variant/; revision=765
.

svn path=/sandbox/libs/variant/; revision=766
Moved one directory up

svn path=/sandbox/libs/variant/; revision=767
hyperlink to index.html fixed

svn path=/sandbox/libs/variant/; revision=768
Relative paths fixed

svn path=/sandbox/libs/variant/; revision=769
Boost.Visitor initial release.

svn path=/sandbox/boost/variant.hpp; revision=792
Eliminated variant apply_visitor workaround.

svn path=/sandbox/boost/variant.hpp; revision=793
Boost.Move ver. 2, initial release.

svn path=/sandbox/boost/variant.hpp; revision=797
Reorganization of Boost.Move

svn path=/sandbox/boost/variant.hpp; revision=803
Eliminated variant extract<T> workaround.

svn path=/sandbox/boost/variant.hpp; revision=808
Reorganized Boost.Move again.

svn path=/sandbox/boost/variant.hpp; revision=809
Bug fixes and source formatting.

svn path=/sandbox/boost/variant.hpp; revision=815
Fixed problem with mpl namespace and argument-dependent lookup under g++ 3.2.

svn path=/sandbox/boost/variant.hpp; revision=820
Minor changes and bug fixes.

svn path=/sandbox/boost/variant.hpp; revision=890
Made variant boost::moveable.

svn path=/sandbox/boost/variant.hpp; revision=891
Updated copyright year.

svn path=/sandbox/boost/variant.hpp; revision=896