Ticket #3187: Add git modules that integrate the webmail user guide from roundcubemail [1] and roundcubemail-plugins-kolab [2].
Add the webmail user guide index page
Refresh the installation guide to include verbiage on importing the GPG key used to sign packages with.
Update the glossary
Add a start to a guide on contributing to the documentation
Supply some of the bug numbers in the example (tracker) ticket for feature enhancement
Supply the verbiage on the NEEDSINFO status
Add a note about having to clone tickets when multiple milestones are targetted
Add more details on the integration with LDAP, and some of the wishlist items
Make a start with the tweaking of Cyrus IMAP
Whitespace fixes
Add the Free/Busy web application reference
Add the directories for the git submodules for user help documentation
Add a make target helpdocs
Update the configuration to ignore content below the second git submodule checked out, which
has symbolic links created in the first git submodule's hierarchy.
Add the new webmail user guide, but also ...

    *   Suppress warnings about documents that are deliberately not in any
        toctree,

    *   Add to that some documents that are not yet in a toctree, because
        they are not finished. This can be used as placeholders for other
        contributors, so that they know a certain page is under
        construction.