Higher-level analysis, Delay range change
Added count_mats.py, a higher-level analysis script that checks for 'rows' of
significant horizontal striations for the same synergy, all muscles, for a given
unit. Also changed range of delays in compute.py to be symmetric, e.g. running
from -297 to +297, passing through 0, rather than going from -300 to +294 and
skipping over 0)