Noted changes to labels in changelog
Added documentation for last undocumented action.

This commit resolves issue #97  However, I also changed the layout of
the colvar page on the manual so I thought I would push it on a branch
before merging it into master.  Let me know if there are any objections
to the changes I have made.
Merge branch 'master' of github.com:plumed/plumed2