Gelencsér Szabolcs / cloud

Clean up DiskActivities in progress on manager init

Feature Table Sorting

Sort vm list, template list and lease list.

vm list and template list are sorted with js if it's enabled

Clean up activities in progress on manager init

Add GPL disclaimers

- node's default ordering is fine
- replacing "-" does not always work so fixed
    for example: ?sort=-na-me

Fix save_as issues

* remove template global unique constaint (fixes #147)
* allow changing name before starting save_as operation

dashboard, vm: implement remove_disk on InstanceTemplate and use it instead of dispatching on appliance type

Update ALL external requirements to current stable.

Using datetime causes a RuntimeWarning because DateTimeField receives a naive
datetime while time zone support is active.

Patching __new__ on an object seems to have lasting effects even after the
context block's end.