Foliage

This version adds new new features:
* The _Change Records_ tab now supports changing the loan type on records.
* A new tab, _Clean Records_, is available. It currently has one capability: to delete "phantom" loans based on user id's, meaning loan records associated with users but for items that no longer exist in Folio.

Changes in this version:
* Fix a bug reported by Donna W. on 2022-06-09, in which it would incorrectly report all loans on the instance associated with a given holdings record, instead of only considering the items attached to the given holdings record.

Changes in this version:
* Fixes an error deleting instance records that didn't have a corresponding SRS record. The new approach just ignores a missing SRS record and proceeds with deletions in the FOLIO storage and inventory systems.
* Now accepts Caltech user id's with or without the leading `000`. Previously, unless a UID had the the form `0001234567`, Foliage would fail to find records. Now it tries a second time after adding leading 0's.
* Updates some dependency versions in `requirements.txt`.

A late-breaking discovery forced another release. It turns out that PyPI will not accept a package that uses a `git+https://` package dependency, which means Foliage can't be uploaded as it was. So, this release changes the `requirements.txt` file again, changes the installation process, and reduces the installation options.

Changes in this version:
* Use a fork of PyWebIO 1.4.0 with just the changes I need to fix a couple of limitations in the framework. Foliage's `requirements.txt` file references the fork in GitHub, so that installation of Foliage will get that version instead of the official PyWebIO version from PyPI.
* Update the (internal) constant used to recognize accession numbers.
* Fix a UI bug in the _Look up records_ tab, wherein clicking the _Look up records_ button while it was already running could result in multiple output streams and confusing output.

Changes in this version:
* If the FOLIO token is invalidated by EBSCO, then when Foliage starts up, the only option given to the user is to quit. If the user couldn't run the command-line version with `-K`, then they were unable to ever cause Foliage to regenerate the token. Fixed. The new code gives the user the option of editing the credentials and trying again.
* On Windows, Excel files might not have been recognized because Foliage didn't consider enough candidate MIME types. Fixed.
* Changed the Lookup tab to print the total number of records found (in addition to the number looked up).