major refactoring. added database backup target and control flag for it
added prop to specify db-backups directory
updated DB upgrade instructions. refs #3173
forced PATH_INFO as value for the "uri_protocol" config setting. This will prevent CI from (correctly) assuming CLI-mode.
Merge branch 'migrations' of https://github.com/ucsflibtopfstedt/ilios into ilios-tests

Conflicts:
	tests/phpunit/ci_bootstrap.php