move file_io into common_classes
bugs fixes, better error reporting
bug fix
include ballroom in dropin classes
customize log file name
bug fixes, move logging to common
reporting improvements

new reports, ability to delete sign-ins
bug fixes
move error logging into common
ignore LOG_FILE
formatting tweaks
sort constants by name
bug fix
move column selector into More Options
tweak table properties

Adjust default column widths, try auto-width=True.
move column selector into More Options
sequence bug fix, UI tweaks
bug fixes, move fie_io to common