- added "periodic debug verbose" debug level
  - changed former "periodic debug" to the latter level to allow not so often, but periodic events
- moved watch dog part out of while loop
- removed "interrupt enable/disable" debug statements
- CAN section:
  - moved cli/sei and canReady = IDLE section out of the switch statements
  - 2 new states introduced: GENERAL_BXOK, GENERAL_OVRTIM
      - added global canCurrentGeneralInterrupRegister
      - actions: just debug informations
- new CAN timer overrun section
  - added global canTimerOverrun 
  - only action: flag reset
    - TODO add async actions
- refactored can(_)ErrorCode


git-svn-id: https://subversion.gsi.de/epics/trunk/hadcon/API-Slave@395 50339f28-a4cd-11e1-ab1f-8360dde1fe65