Minor tweaks to server status page in Dashboard
Added render settings picker

Now you can drop settings scripts in the render_settings folder and
they will be automatically picked up and displayed when adding a shot.
Option to use file settings when rendering
Layout cleanup: sidebar is gone!
Code cleanup: removing unused junk
Minor menu content fix
Shots can be reset

This deletes all jobs and creates them again. Once that a shot has been
resed, it must be manually restarted.