Fixed two problem with airlock/APC commit:

- Debugger now sends messages to user instead of usr(whoops)
- Can now close emagged door with crowbar so you can take out circuit
- Couldn't weld emagged doors
- Replacing the circuitry should now be sufficient to fix an emagged door.
Adjusted event announcement delays.

Also improved some radiation belt announcements.
You can't close emagged doors anymore, but you can still remove circuitry.
Merge pull request #2839 from CIB/master

Fixes to airlock fixing stuff