A few assorted landed_titles fixes

- added kharijite religious head title
- e_seljuk_turks was still tribe=yes (and landless=yes).  in vanilla,
it is neither, and nothing is tribe=yes anymore. could be a part of
recent weirdness (presumably last remaining tribe=yes title in SWMH).
- k_avaria and k_lombardy are used for CoAs in the 769 start.  inherited
vanilla title history references them, so I added them.