BUG: Sync patch version to match latest stable release

The difference was explained by the fact the patch and tweak release have
been made of dedicated SVN branch with backporting commit from trunk,
the increase of tweak/patch number didn't make it back to the trunk.

This commit will minimize confusion for user by ensuring both the latest
stable release and the current nightly have the same major/minor/patch
version numbers.

Also added an entry to the post-release task list.
See http://www.slicer.org/slicerWiki/index.php/Documentation/Nightly/Developers/Versioning#post_release

Fixes #3265

git-svn-id: http://svn.slicer.org/Slicer4/trunk@22294 3bd1e089-480b-0410-8dfb-8563597acbee