MItAC update

1) new readings and additions to Wiki bibliography ("The Columbia Long-Playing Microgroove Recording System" and "Recording and Reproducing Standards")

2) software top-level design (assuming parser hands over 2D array of Z heights)
a) getbottom.m - normalizes heights and removes data above threshold to leave bottom groove only
b) findcenter.m - locates center of record (whether in array or outside of array) by finding peak correlation with circles of various sizes
c) findgrooves.m - locate grooves along left or bottom axis (start) and indexes their start locations.
d) findspacing.m - determines spacing of grooves from groove locations
e) unwrap.m - unwraps undulations onto the 1D axis