added interrupt based sending of messages
more work on interrupts
removed unused operations
modified
fixed some errors - still not receiving complete data
added fifo lib
some fixes
added some debug and set some variables
Merge branch 'interrupt'

Conflicts:
	testscripts/gpiotest.rb
Merge branch 'master' of github.com:computerlyrik/haqbus-avr-lib

Conflicts:
	usart.c