[v7r0]NEW: Resources instead of CSHelpers

Removed wrappers in RSS.CSHelpers over Resources.

**MySQLdb Deprecation warning** removed using warning package ( please, check DIRAC.Core.Utilities.MySQL.py, 
DIRAC.DataManagementSystem.DB.FTSDB.py & DIRAC.RequestManagementSystem.DB.RequestDB.py to confirm )