DATA SAVE: Handle matlab files with signed/unsigned data better.
Datafile in: Add the ability to read MATLAB files into the osc app

             Don't use this yet - it crashes with some weird memory
	     issue

Signed-off-by: Robin Getz <Robin.Getz@analog.com>
check in some .mat files to test/verify Datafile in function

I&Q of three sine waves with different amplitude (0.3/0.6/0.9). The
files with “2ch” in the file name are the ones with I and Q separately
(2 real signals), while the others are I+Q (1 complex signal).
move mat files to waveform directory