Some major technical fixes:

Some major technical fixes:
1. Changes to protect GRP from unvalid values coming from DCS.
2. Implemented way to distinguish behaviour of the preprocessor when dealing
with polarities according to the status of the magnet. The threshold values
have been provided by DCS (Lionel Wallet). See below:
2.a. The L3 magnet is declared
ON if at least one of the values read is greater than 350 (A units); OFF
otherwise.
2.b. The Dipole magnet is declared ON if at least one of the values read is
greater than 450 (A units); OFF otherwise.