Generate config files for softIoc

Added code to generate the necessary config files for the softIoc binary
from the settings in the config file.  Also added a command line option
to call this code and then exit.
Add PyEpics library

Since RHEL6 doesn't seem to have an rpm for the pyepics library, I'm
adding its source code directly to the repo.  Hopefully, this is a
temporary thing until we can get a pyepics rpm for RHEL6