Integrating code to allow a EPICS CA based SDF system to be built off of the...

Integrating code to allow a EPICS CA based SDF system to be built off of the front ends EPICS sequencer.

The code adds two preprossor defines CA_SDF & USE_SYSTEM_TIME.  If both are set a stand-alone IOC can be built with the goal of providing monitoring for arbitrary CA channels.

Notes:
* This is committed as it goes through testing, and the CA_SDF code is not yet production ready.  It needs among other things to not have a hardcoded file to read channels from.
* The build system has not been modified to take advantage of this yet.  For test purposes this has been built by hand.


git-svn-id: https://redoubt.ligo-wa.caltech.edu/svn/advLigoRTS/trunk@4060 6dcd42c9-f523-4c6d-aada-af552506706e