reduced top and bottom margins
updated jquery and jquery-ui

- jquery 1.9.1
- jquery-ui 1.10.1
- use jquery CDN instead of local copies
fix for uninitialized vz.plot and minor Umlaut fix
frontend fixes (and small extensions)

- save only cookies for root entities, not ones in aggregators (these are implicitely saved with their group)
- don't panic if the middleware returns an error for one of the saved entities, just ignore it and continue. This happens e.g. if an entity was not deleted in the current frontend.

and a bunch of fixes for moving entities around in the entity list:
- entities are now removed from the source aggregator (or root) when moved to new one
- you can now move an entity from an aggregator to the root list by dropping it over entity list table head row
- don't allow dropping an aggregator onto itself (also prevented by the middleware since lately)
- only allow dropping rows of the entity-list (e.g. popup dialogs could be dropped before)
- synchronize reloading entity details and entity table redraw
- fixed sorting of channels before aggregators