- changed assignment of canErrorCode

- enabled TIMER OVERRUN interrupt
  - default timer t_CANTIM 13.4s

- canGetGeneralStatusError refactored to canShowGeneralStatusError
- canShowGeneralStatusError:
  - extended to care also for CANGIT states
- canIsGeneralStatusError refactored to canIsGeneralStatusErrorAndAcknowledge
- canIsGeneralStatusErrorAndAcknowledge:
  - added CANGIT
    - including interrupt reset
  - added 2 new canStates: 
    - GENERAL_BXOK
    - GENERAL_OVRTIM
- canGetMobError refactored to canShowMobError

- ISR (CANIT_vect):
  - added CANGIT 
  - removed CANGIT |= 0; statement

- ISR (OVRIT_vect):
  - added
  - setting flag
  - TODO: missing prompt action 


git-svn-id: https://subversion.gsi.de/epics/trunk/hadcon/API-Slave@397 50339f28-a4cd-11e1-ab1f-8360dde1fe65