use float instead of scientific notation for results
move loading of data to _read_wingj_files()
allow for directory instead of all WingJ files individually
allow a directory for the result files as well, use default names
allow caption and filters for file open and save dialogs
add Qt callback function to select an existing directory
use new variant to specify just the dir instead of all in- and out-files
fixup pyuic4 script for new path and naming scheme
UI with 2 infiles and a spinbox (no outfiles)
allow specification of a starting directory
simpler GUI using the directory option