gnucash maint: Multiple changes pushed

[Christopher Lam]

Updated	 via  https://github.com/Gnucash/gnucash/commit/f2354d6b (commit)
	 via  https://github.com/Gnucash/gnucash/commit/1516bb18 (commit)
	 via  https://github.com/Gnucash/gnucash/commit/a078921a (commit)
	from  https://github.com/Gnucash/gnucash/commit/cf088f2a (commit)



commit f2354d6b2af329c5cc849fc9d7908884c4b7fdc2
Author: Christopher Lam <christopher.lck at gmail.com>
Date:   Sat Oct 29 13:47:33 2022 +0800

    [test-qofbook.c] add test for gnc_features_set_unused

commit 1516bb18b070d6fbc0388791edb8cb1040ad0d6e
Author: Christopher Lam <christopher.lck at gmail.com>
Date:   Thu Dec 2 22:12:29 2021 +0800

    [gnc-features.cpp] backport gnc_features_set_unused from master

commit a078921a33e3ea1e2f3427565fe8d348205b3f6a
Author: Christopher Lam <christopher.lck at gmail.com>
Date:   Thu Dec 2 22:12:12 2021 +0800

    [qofbook.cpp] backport qof_book_unset_feature from master



Summary of changes:
 libgnucash/engine/gnc-features.cpp    | 17 +++++++++++++++++
 libgnucash/engine/gnc-features.h      |  7 +++++++
 libgnucash/engine/qofbook.cpp         | 16 ++++++++++++++++
 libgnucash/engine/qofbook.h           |  1 +
 libgnucash/engine/test/test-qofbook.c |  4 ++++
 5 files changed, 45 insertions(+)