added the option for the control unit to specify if
the control unit database needs to be wrote on disc
instead then in memory
Merge pull request #34 in CHSBNDL/chaosframework from feature_cu_db to development

* commit '6f68f102a57c96efbdfe2ee4f2cfe13322684572':
  added the option for the control unit to specify if the control unit database needs to be wrote on disc instead then in memory