Found a bug with unit_graphics.x (thank you nhparker20)

ALERT: Jews + Romans (SPQR, Caesar, Pompey) resulted in GPIECE error. Dunno why.

[14.2.22]
More tweaks:

- Early Roman cavalry units removed.
- Roman factions - SPQR, Julii, and Pompeians now online. Note that SPQR (Americans) control a vast number of central and southern Italian cities, as well as many, many outposts throughout Greece.
- Julii Romans now lose access to all low-tier Roman cav. Instead, they train the same cavalry units as the Aedui (see the new tribe mask chart).
- Pompeian Romans get access to war elephants (ref battle of Thapsus 46 BCE).
- Greek mercs: Illyrian archers, Greek archers and Greek slingers distributed between SPQR and Julii.

Elsehwhere:
- Seleucids are being gradually kicked out to make way for new Scythia faction.

[13.2.22]
- Animations for some walkers - scholars and priests - replaced. Apparently, they were proven in Warbirth to be faulty.

[11.2.22]
- Gens Pompeia, SPQR are now WIP.
- Levy units for Gens Pompeia and SPQR have mostly been sorted out at this juncture but it may take a little more time before both factions are complete.
- I want all 3 Roman factions - SPQR, Julii and Pompeia - to have the full list of upgrades.