- Add free capacity quantity property for Computer, updated by alarm
  when computing capacity scope
- Refactor said alarm script (split one big function into multiples
  small reusable scripts)
- Add "Free Instances Amount" column on "Usable Networks" view
  showing the number of free slots for a specific Software
  Release on the public computers in the network
- Add "Free Instances Amount" column on "Usable Computers" view
  showing the number of free slots for a specific Software
  Release on the computer
- Remove "Allocation Scope" column from "Usable Networks" view
  as it caused time-out for big networks