A/T compcor typo corrected, stores and takes info from metadata, allows user to limit TSNR table in QA report to a selective list of ROIs
Merge pull request #15 from warrenwinter/QA_enhs_fixes

enh: save metadata readouts from preproc, fix: access metadata readouts for QA, enh: selective ROI list for QA, fix: A/T compcor labels in QA