Updates:
- Detect external file modifications by checking the file's last modified time just prior to saving.
- Preserve the choices in the field format when switching between Choice and Combination field types.
Bug Fixes:
- Fix a bug that prevented child type limits from being set back to all types.
- Preserve the modified status of the config dialog when switching between windows displaying different files.
- Fix problems occurring when the escape key is used to close various non-modal dialogs.
- Avoid a traceback error message when attempting to import a CSV file with a bad header row.
- Fix a bug using child count fields in live HTML exports.