* src/IDF/Key.php: new column "type" which is either "ssh" or "mtn";
utility functions to query the mtn key name and id as well as
all available key types for the current IDF installation
* src/IDF/Migrations/16KeyType.php: needed migration script
* src/IDF/Plugin/SyncGit/Cron.php: ensure only SSH keys are handled
* adapt forms and templates accordingly
"usherConfigured" to denote whether we render links to the usher
control functions in the forge administration
* src/IDF/Scm/Monotone.php: moved IDF_Scm_Monotone_Stdio into
separate file src/IDF/Scm/Monotone/Stdio.php
* src/IDF/Scm/Usher.php: new class to query and modify the state
of a running usher instance
* src/IDF/Views/Admin.php: add actions to query the list of
configured servers, edit their status, view their open connections
and control the state of the usher as a whole
* src/IDF/conf/idf.php-dist: optional usher configuration added;
mail address of monotone-users added; spelling changes
* src/IDF/conf/urls.php: added needed URLs for usher actions
* src/IDF/templates/idf/gadmin/base.html: usher links
return a list with selectors as keys, otherwise the main menu won't
link the active revision, but instead use the main branch
* changelog.html, tree.html: shorten the branch / tag output a bit
(still ugly to have a fixed output like this, though), link tags
by their selector, no longer by their revision ID. We loose some
flexibility here, since tags could actually mark different
revisions, which are now ignored
add two scenarios, one with a single, global database and one with
multiple project databases and usher as proxy; add an option for additional
command line options for the mtn process; remove the protocol type
configuration option - we're handling this implicit with the new
mtn_remote_url configuration
* Monotone.php: add the IDF user for ssh:// URIs; add support for remote_stdio
and rework the command line stitching
* IDF_Project: optionally give getSourceAccessUrl() a commit argument, so a particular VCS module can determine a subset of revisions to pull for the specific revision which is browsed
* IDF_Scm_*: add the argument null'd for all VCS; implement a branch lookup for monotone
* tree.html: display the correct branch to clone under each revision tree
