Description of problem:

A signal is currently used to tell ccsd to update a config file.  This
has a number of limitations:
1. signals are asynchornous, making it hard to error results
2. Although I believe most issues have been worked out, signals can be
recieved at any time, making the code more complex because it has to
do various forms of locking to ensure that processing doesn't happen
while things are changing

The code complexities and various hacks to do meaningful error
reporting should be replaced by a more eligant solution.  That
solution involves ccs_tool taking an update file and sending it to
ccsd for processing.

Because a sizeable amount of code will have to be changed to
facilitate this, it may not be advisable to change the code so close
to a release.