This serves two purposes. It helps to prevent regressions
and it allows focusing on features that still don't export properly.

Also created rtfexport3 since the other two are already very full.

Change-Id: I7d580f575c1debe344275869fefcbba6e29cbad6
Reviewed-on: https://gerrit.libreoffice.org/39842Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Justin Luth <justin_luth@sil.org>