incorrect use of serial buffer status corrected

[yuhu-]

• The inadvertent use of bus.availableForWrite() instead of bus.available() led to delays
  -- incorrect use of serial buffer status corrected
• ebus library simplifications (library updaed)
  -- unnecessary if's removed in ebus library
  -- set lockCounter inside of resetActive
  -- call passiveErrors or activeErrors when an error occurs
• Scan of non-existent addresses led to resets
  -- counter for failed 0704 added