bbfrederick/rapidtide: Version 2.0alpha13 - 2/22/21 checkpoint

Version 2.0alpha13 (2/22/21) (package) Copied Taylor Salo's improvements to build and deployment from the master branch. (all) Ran all python files through Black to give consistent formatting (really, truly this time). (all) Implemented new, generalized text/tsv/bids text file reader with column selection (readvectorsfromtextfile). (atlastool) Fixed some import and syntax issues with numpy. (showarbcorr) New program to do crosscorrelations on timecourses with different samplerates. (happy) Fixed column selection bug with BIDS files. (happy) General formatting improvements. (dlfilter) Made diagnostics more informative to help get dlfilter enabled