Improvements to the physical library commands

After testing the new physical library commands in preproduction, there are a number of improvements that can be done:

• Change the --physicallibrary/--pl option to --name/-n
• For cta-admin pl ls
  • gui -> gui url
  • webcam -> webcam url
  • npcs -> physical cartridge slots
  • nacs -> available cartridge slots
  • nads (wrong, should be npds) -> physical drive slots
• change order of columns to match the one of ll ls = in particular comment goes to the end
• more than one logical library can be in a physical library
• report proper message when removing non-existing library

Another suggestion was to make the error messages "nicer". However, this must be discussed further.

The related MR should be merged after schema version 14 has been deployed.