New OBSERVATION_OVERVIEW overview screen

I have added a new screen that sumarizes the overall OBSERVATION status of the detector:

$USERAPPS/sys/common/medm/OBSERVATION_OVERVIEW.adl

It is meant to be informative and (hopefully) self explanatory for the operators.  It includes all things going into determining OBSERVATION status:

• ODC "Interferometer status" (aka OBSERVATION) status, which is AND of:
  • ODC "Observation ready" (aka READY) bit, which is AND of:
    • ODC Guardian top node status (GRD-IFO_OK == True)
    • ODC EXCITATION monitor (no excitations active)
  • ODC "Observation intent" (aka INTENT) bit, which is set by operator

When the system is not ready the screen looks like this:

The EXCITATION monitor will turn red if there are any excitations present.  Once GRD-IFO_OK is ready, and there are no excitations, the READY box will turn green.  Once the operator then sets the INTENT bit to "UNDISTURBED", the whole box will turn green to indicate that we are in OBSERVATION MODE:

Hopefully it is self explanatory, but please let me know if there are any questions.

I have embeded this screen into to the GUARDIAN_OVERVIEW screen as well.