Add htmlpurifier filter for Skype button; let script tags through from TinyMCE & don't rewrite 'skype:' urls

The length of time since last access that tells whether a user has been online recently is configurable.

The block can also be disabled with a configuration parameter.

More work on profile views and three new blocktypes (myfriends/mygroups/myviews) to emulate current profile page TODO: - write wall blocktype - change install default profile view hook to add blocks - upgrade path (xmldb & migration) - blocktype and category and singleblockperview implementation

    - TESTING

Use the session's authinstance information for userauthinstance rather than $USER->lastauthinstance, which, while it might be correct due to session caching in the $USER object, isn't strictly "right".

The member list is able to be ajax-ly paginated through, and shows more detail than the previous one.

The page layout is showing shadows of what it will eventually become, although a lot of functionality isn't there yet - like joining/leaving the group.

It's much less ambiguous. Should help with users confused as to what it does.
(cherry picked from commit 15cfe974)

This makes it easy to tell when you are doing this on all pages - not just on pages where the sidebar is visible.
(cherry picked from commit ba080c55)

The old theme used to do this, somehow it has stopped since the new theme landed.

Look for smarty in htdocs/lib/smarty/libs, which is consistent with upstream (and therefore debian). Look for mahara plugins in a separate directory.

This is so the debian packaging can depend on the smarty package in debian rather than bundling our own.

Keep the  compiled copies of templates in per-theme directories. This prevents conflicts especially when switching themes.

Don't comment out $jswwwroot because it's still part of the javascript, even if it is commented out.

theme_get_parent was royally screwed, fixed. Made it so that if you set $theme->parent = null in the theme config.php then the theme won't inherit from the default theme.

Don't specify a document_base_url for TinyMCE. This fixes a problem I observed where dragging an image around inside the WYSIWYG editor broke the path to it.

* If you have not tags, it now tells you rather than just mysteriously disappearing
* If you click on a tag and it's already in the input box, it is removed instead, giving a nice toggle ability. It handles the commas/spacing too.
* Removed a debugging line that had been there for ever.