More docs about SLA CF

a1b70753 fixed the SLA part of UPGRADING-3.0 but did so in a way likely
to be missed by users upgrading from 3.0.2.  Add a specific 3.0.3
upgrading note.  Additionally, further document how to remove the CF and
that new installs of RITR 3.0 are unaffected.
upgrade Module::Install::RTx
Update MANIFEST for new test and removing README generator
Merge branch '3.0-trunk' into 3.2-trunk

Conflicts:
	META.yml