Timeout handling and recovery in loop() function now operative.
Start-up check for I2C signals short to ground added.
Initial I2C device probe speed up.
Possible infinite loops in I2C AVR native driver during fault conditions removed.
Corrections to I2C code:
1) I2CManager_Mega4809.h: Correct bitwise 'and' to logical 'and' - no impact.
2) I2CManager_Wire.h: Ensure that error codes from Wire subsystem are passed back to caller in queueRequest().
