also, use tab to indent

- move api to own file
- really allow several profiles (one thread per profile)
- global pool
- pool per profile
- Remove unused globals.calls
- Check for closed listener before sending data
- use mutex for hashes

- Shared lines (same line on several phones)
  + Active lines stored in db
- Separate SQL mutex per profile
- New event skinny::call_state
- Clean port_message
- More protocol understanding:
  + stimulus may have call_id
  + off_hook may have call_id
  + set_ringer may have call_id and line_instance
  + New DisplayPriNotifyMessage
- Use Cisco terms for Call state
  + Congestion -> LineInUse
  + CallRemoteMultiline -> InUseRemotely
- Add line_instance to Lines table (relative position contrary to
  absolute position)
- Less assertions as FS already does some

FreeTDM: freetdm.pc.in was still using "OpenZAP", fix the name and library name. Leaving the homepage tag alone for now until a new one has been set up(?).

This reverts commit 3c0cb60f.

This went in too early; it belongs with a patch set that handles
builds from both git and svn.