added eitwave_velocities.py utility for plotting velocity histograms.
deleted fillLine.py. Function transferred to eitwaveutils.py.
fixed assignment bug for posdiffs. Now define posdiffs by posdiffs = copy.deepcopy(diffs), instead of posdiffs=diffs.
developmental update: added into eitwaveutils a function to strip out wavefront position and width information. Added a function to eitwave_velocities.py which performs a linear fit to the position measurements of a given column.
fixed bugs in velocity_polyfit function. Now correctly ignores null position values.
added import copy statement to data_hough_detect.py
added call to eitwaveutils.wavefront_position_and_velocity and a few comments.
added width_histogram function to eitwave_velocities.py
renamed eitwave_velocities.py to eitwaveplot.py
removed deprecated file eitwave_velocities.py (replaced by eitwaveplot.py)
Merge pull request #22 from aringlis/master

Added plotting routines for eitwave result visualisation, and added extra function to eitwaveutils.py
Merge remote-tracking branch 'upstream/master'
Committing lingering changes