SEaPT v0.3

After feedback from DMW's first look at SEaPT, the file selection and loading routine was modified. Instead of opening a single file selection dialog, the entire csv dir is viewable, listing all sta.csvs in a scrollable listbox. Single-click the sta.csv to edit, select the desired columns, then press [Display Sel Cols]. To view the entire sta.csv, there is a [Display All Cols] button as well.
As per DMW's suggestion, Cruise, Ord_Occ, Niskin, Sample, and Depth are pre-selected by default but can be unselected if desired.