made a program (file_finder) to be able to search either through a single...

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