Improve webservice prioritisation.

Ctrl-F5 Refresh - Priority/Important
Redirect - Priority/Important
Saves/submissions - Priority/Not-Important
Everything else - Normal
Tweak when we prioritise and don't cache
Space moved

As per bitmap's review comments, I have relocated the errant space from
one file to the other.

Damn pesky spaces - always sneaking off and repositioning themselves
where you don't want 'em.
Address Fresno comment

Put important back to True so that this is LIFO on the priority queue.
Merge pull request #166 from Sophist-UK/sophist_improve_xmls_prioritisation

Improve webservice prioritisation.