Using moodle_url where possible is preferable to hardcoding uri's as
moodle_url is able to take care of alot of the formatting for us.
In this instance, it handles the $CFG->admin url path for us.
Several places in admin/mnet pull in required files using a hardcoded
admin dir string, as this is configurable it needs to use $CFG->admin
instead.
Places where the url is passed through moodle_url don't need to be
updated as that already automatically translates the urls for us.
While fixing MDL-30170, the following tiny usability details were
improved along the way:
* the maximum length of the peer site title and the hostname is now
validated (this was actually a real bug as the default value is pre-loaded
from the peer) so the admin gets a nice validation error instead of
the database write exception when trying to register a host with a
longer site title.
* hard-coded English string 'All Hosts' is now localized
* the hostname link in the list of MNet peers leads to the peer itself
The patch highlights the undelete radio selector at the host edit form.
It moves it to the end of the form (near the submit button) and displays
an explanation above the radio selector.
Also, the list of deleted hosts is now displayed below the table of
active peers at the Manage peers page.
The data returned by mnet_get_hosts() function now contain the deleted
status, too. It is possible to obtain deleted hosts from that function
now.
There is no need to have whole featured theme selector with previews
etc here. Following the same form element as they have in Mahara, the
theme can now be selected for a given peer at 'Review host details' tab.
I have also noticed that force_theme and theme columns are redundant at
the moment. Keeping them both for future improvements, though.
