now has midnight correspond to 0, plots that start mid-day are plotted midway through the plot, and a second plot is made if the time goes over 24 hours

Minor improvements made to some tests. Completely re-did hbb_std_dev, hbb_lw_nen, hbb_sw_nen checks. Created cross_correlation check

made a program (file_finder) to be able to search either through a single file, a directory of files, or a directory of directories of files to find the ending it's looking for. this is so each program that needs functionality doesn't need the same lines of code copy-pasted into it. diagnostic_plotter and file_finder were implemented in testing_quick_vis. when a test has >80% flags, it will automatically make a plot of the corresponding variables. a text file with a record of tests with <100% validity is also made with the tests' percent validity

added air_interferometer_check to quick_vis.py and fixed an issue so qc_percent is 1 when missing_data_flag_check is 1; make minor adjustments to detectory_temp.py and testing_bst.py

Merging everything to master so the QC code is updated and because a secondary branch isn't really necessary.