Added PVs for separate termistors (ECL:S%dBARREL:{TEMP01,TEMP02,TEMP03}), masked thermistor 1 for S34

Added 'base' submodule with the scripts relevant for all EPICS CA servers. Also removed obsolete 'externals' scripts

 1. Sectors and specific thermistors can now be masked.
 2. Temperature and humidity PVs now have units specified properly.
 3. Rewritten some parts of the data handling.

Rewritten epics ca server to get information from all sectors and to internally parse file contents, without calls to envext