Added UE9.ipAddressFilter method and ue9IPAddressFilter.py example.
Fixed writeMem and eraseMem in U6 class. Fixed setChecksum in LabJackPython module to accept commands of at least 6 bytes.
Removed U6 DSP Feedback command class. Experimental feature was removed from firmware.
Corrected spelling typos. Thanks to Kim for pointing this out.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	Examples/u3Noise.py
	src/u6.py