1/ Add ability to use user-supplied map API keys.
2/ Fix bug in image regions with Apple face information metadata.
3/ Don't include Exif subject area in image regions.
4/ Remove Bing map tab.
5/ Other minor improvements and bug fixes.

1/ Fix MapBax map bug with numeric country/region locale codes.
2/ Fix occasional "KeyError: 'bounds'" bug in Google Map search.
3/ Other minor improvements and bug fixes.

1/ Fix bug in Flickr/Ipernity image region sync.

1/ Configuration files are backed up each time Photini runs.
2/ Backup config is used if current config gets corrupted.
3/ Hierarchical keywords store allows any Unicode characters.

1/ Read and write MWG and MS image region metadata.
2/ Added "people in image" to descriptive tab.
3/ Other minor improvements and bug fixes.

1/ Fix bug with case insensitivity of hierarchical keywords.

1/ Sync of hierarchical and "flat" keywords is now automatic.
2/ Importer "refresh" button now reloads file list.

1/ New hierarchical tags editor.
2/ Multiple map markers can be selected by multiple clicks.
3/ Added macOS photini-post-install command.
4/ Other minor improvements and bug fixes.

1/ Fix problem dragging onto map with some Python/Qt combinations.

1/ Regions tab image display is zoomable and draggable.
2/ Qt package preference can be changed in settings dialog.
3/ Selected image thumbnails use system "selected text" colour.
4/ Map marker colours can be changed in settings dialog.
5/ Better handling of missing WebGL in map tabs.
6/ Improved 'photini-post-install' command.
7/ Other minor improvements and bug fixes.