To avoid unnecessary confusion between the newly plain code and any instance of
the old extension still installed (per-user or shared), I renamed the UNO
implementation identifier org.openoffice.pyuno.LanguageScriptProviderForPython
to org.libreoffice.pyuno.LanguageScriptProviderForPython.  Also, existing
installations of the extension are explicitly not migrated to new user profiles.

Change-Id: Id3dd66ba5e52e0962f7ad0ccb5e4ad5b0bec97fa