Mia-accounting

* Fixed the error calling the old setEnableDescriptionAccount method in the saveOriginalLineItem method of the JavaScript JournalEntryLineItemEditor class.

* Updated to require SQLAlchemy >= 2.
* Added the change log.
* Added the VERSION constant to the accounting module for the package version, and revised pyproject.toml and conf.py to read the version from it.

* Updated to allow editing the description of the journal entry line item with offsets or are offsetting to original line items.
* Updated not to override the existing description of a journal entry line item after choosing the original line item to offset to.

* Rewrote the unapplied original line items and unmatched offsets.
* The unapplied original line items and unmatched offsets are both in the report submodule. They can be filtered with currency and period now.
* Show the unapplied original line items and unmatched offsets together, and added the accumulated balance in the unmatched offset list, for ease of reference.
* Removed the account code from the journal entry detail and journal entry form for mobile devices.
* Made the account options in the reports to be scrollable.

Changed the sample data generation in the test site live demonstration from pre-recorded data to real-time generation, to avoid the problem with the start of months and weeks changed with the date of the import.

Added the sample data generation and database reset on the test site for live demonstration.