Reviewed comments made by Josh and removed debugging print statements and changed _get_channel_start to get_channel_start within SNCL.py and any other script which references this function.

Created a new branch to contain changes to IRISFactory.py and IRISSNCL.py, the channels reported by ASL and the expected channel coversions have been changed so that LF1 and LF2 correspond to V and U. The reported azimuth and dip is also checked and changed if the polarity is reversed.