drivers.py -- added timeout to simbad, fixed -00 dec problem

simbad lookup now has a 5 second timeout by default. There was a bug in the interpretation of declinations from 0 to -1 (classic error). Now fixed I hope.
usdriver.py -- fixed bug in message about rtplot server

It was trying to join a string and integer incorrectly.
filterwheel.py -- improved logic of close and removed \n

I removed lots of extra carriage return characters from debug statements and improved the close operation so that it checks whether the wheel is thought to be initialised before closing it.
uspec.py -- improved filterwheel access on start

A failure to initialise the whel on start resulted in a situation that could not be escaped since the wheel was left connected but not initialised and then the connect / init steps were skipped on the next attempt. This should now be fixed.