Adjust the files for the release of version 2.10 today,
Undo my mistake of preparing release 2.10 on the trunk.
Tag the 2.10 release -Explorer- of the p3d project.
Commit a binary that includes all the modifications up to, and including, revision 5698.
Create a branch for release 2.10.
Commit a binary that includes all the modifications up to, and including, revision 5696.
Modify some strings to indicate that this is release 2.10.
Remove sav-2022-p56, reintegrated with trunk in r5694.