Better automatic temperature control state names

[henriquesimoes]

I've been thinking about the RFFETempCtl-SP PV. RFFE has the temperature control (which might or might not be used, i.e. "on" or "off"), but what this PV is really changing is the operation mode of temperature control: whether it is manual (off) or automatic (on).

It makes more sense for me if we either:

1. name the PV with a reference to automatic operation mode (e.g. RFFEAutoTempCtrl-SP); or
2. change the ZNAM to manual and ONAM to automatic.

Originally posted by @henriquesimoes in #1 (comment)