Foliage

This version fixes a bug in exporting storage (rather than inventory) records.

This version fixes a bug in printing inventory records in summary form in the _Look up records_ tab.

Changes:
* Fix bug in printing item summary with notes, in the _Look up records_ tab.
* Print notes for instance records in the summary view in the _Look up records_ tab.

Changes:
* Fixed: it was too easy to cause the initial credentials screen to disappear by accident, and on Windows, simply switching away from Foliage and switching back would cause it to disappear, leaving the user in a lurch.
* Fixed: exporting from the _Look up records_ tab would export all searches done in a session, not just the most recent search. It now exports only the last search done.
* The summary table format in _Look up records_ now shows the location names, not just location identifiers, for records that have locations (items and holdings).
* The exported results from _Delete records_ now includes additional record fields beyond just the record identifiers.
* The description of the checkboxes on the _Look up records_ tab are hopefully more clear.
* The macOS app now starts faster, and the installation `.dmg` file is slightly nicer.
* The _Other_ tab provides a link to the online help pages.

Changes:
* Now automatically handles creation and deletion of holdings records as needed when changing the permanent locations of items.
* Now supports deleting instance and holdings records.
* Now supports uploading `.xslx` files in addition to text files, for uploading lists of identifiers.
* Fix bug in Change tab: if the user supplied instance id's, Foliage didn't correctly detect it, and didn't complain.
* Fix bug in exporting the UUID lists: Foliage would produce an error when attempting to export in CSV format.
* Fix the title of the Foliage page in web browsers; it should be "Foliage" but instead was an internal description of a function in the code.
* Fix searching for holdings by instance hrid: Foliage would incorrectly report no holdings found.
* Fix other internal bugs.
* Removed splash screen on Windows because it fails to work outside of my development environment. I've [posted a question on the PyInstaller forums](https://github.com/pyinstaller/pyinstaller/discussions/6542) asking for help.
* Add "read me first" file to mac installer.

This verion fixes some minor internal bugs.