Update the version numbers for the 4.7.0 release.

.github/workflows/moodle-ci.yml

api/config_sample.txt

api/docker/docker-compose.dev.yml

api/docker/docker-compose.yml

doc/en/Authoring/Answer_Tests/Results/AlgEquiv.md

doc/en/Developer/Development_history.md

doc/en/Developer/Development_track.md

doc/en/Developer/Releasing.md

doc/en/Installation/STACK_versions.md

stack/maxima/contrib/prooflib_test.mac

stack/maxima/stackmaxima.mac

version.php