Copy property_tree to release branch.
rm cmake from the release branch before it goes out broken.  Policy dictates that you never commit to release, you commit to trunk and merge to release.
Merge standards conformance fixes for Boost.PropertyTree
Merge documentation fixes.

* Use `doc/src/*.css` instead of `doc/html/*.css`.
* Remove wiki and people directories.
* Some documentation fixes.
* Left out `minimal.css` changes and boostbook changes because of clashes.
Merged r59734 and r61606 from trunk; fixes #3594 and #4092
Merge long-overdue PTree changes to release (boost)
Merge long-overdue PTree changes to release (libs)
Merge more PTree fixes to release (boost)
Make PTree's parser_writer_settings fields non-const, so that the struct is assignable.
Merge simple fix for non-ascii XML parsing to release. Fixes bug 4340.
Merged revisions 66498 via svnmerge from 
https://svn.boost.org/svn/boost/trunk

........
  r66498 | eric_niebler | 2010-11-11 15:28:11 -0500 (Thu, 11 Nov 2010) | 1 line
  
  add missing includes, fixes #4841
........
Merge r68990 to release just before 2.46.1, because it's a critical and low-risk fix. Sorry about not waiting for permission, but I won't have access to this computer again until after the release. So if this merge is a problem, just revert it.
Merge r68990-68993, several fixes to PTree. Fixes bug 1678. Fixes bug 4387.
Merge r68990-68993, several fixes to PTree. Fixes bug 1678. Fixes bug 4387. Forgot to commit these together with the header part.
Merge UTF-8 XML support improvements (r69622) to release. Fixes bug 5203.
Merge r70664-70666 to release. Improves INI parser and brings improvement to docs. Docs should now at least no longer contain completely incorrect examples.
Merge [72000],[72001],[72003], [74691], [75587], [75589], [75590], and [75593]
from trunk.
Fixes bug 4840.
Fixes bug 5259.
Fixes bug 5281, I think.
Fixes bug 5944.
Fixes bug 5757.
Fixes bug 5710.
Fixes bug 5307, I think.
Merge r78550 to release. Fixes an outdated test to work again. Fixes bug #6785. Fixes bug #6808.