Actually, there are some things in the unordered code that aren't ready for
trunk, so I'll rename the branch and create another one to be added to trunk
later.

SVN-Revision: 42182
Fix group_hash's return type.

SVN-Revision: 42197
Restore the extra warnings in the unit tests.

SVN-Revision: 42198
Make a cast explicit in order to avoid a warning.

SVN-Revision: 42199
Use 'BOOST_UNORDERED' prefix for macros.

SVN-Revision: 42203
Merge in changes.

SVN-Revision: 42210
Don't add size_type to pointers, cast to difference_type.

SVN-Revision: 42215
I messed up the last commit, this fixes it.

SVN-Revision: 42216
Get rid of last_in_group.

SVN-Revision: 42218
Use node_count to implement group_count.

SVN-Revision: 42219
Some minor changes for Visual C++.

SVN-Revision: 42231
Inline some more methods.

SVN-Revision: 42233
Some of the changes to the introduction mention in the review. Hopefully this
will make it a little clearer.

SVN-Revision: 42335
Try to make the buckets explanation a little easier to read. Most of the
changes were based on Jamie Allsop (same for the last commit).

SVN-Revision: 42336
Specify the namespace for 'std::out_of_range' in the reference documentation.

SVN-Revision: 42339
Rewrite much of the 'controlling the number of buckets' section.

I'm trying to make it clearer. It's a bit tricky as the standard doesn't guarantee much.
Instead of diving straight into the details I have tried to give the reader a rough
idea of what 'rehash' does and what the load factor is. This is hopefully enough to
understand the more detailled discussion of how you can control the number of buckets.
Then finally I discuss iterator invalidation.

SVN-Revision: 42345
Move the table summarizing methods for controlling bucket size next to the discussion of these methods. The paragraphs about insert and invalidating iterator moves on to something else.

SVN-Revision: 42346
Fix the badly marked up bullet points.

SVN-Revision: 42348
We now have cbegin and cend for local iterators.

SVN-Revision: 42349
Minor tweak.

SVN-Revision: 42520