Update CEL_End.sql

Commented out the section that gives a free scientist. The Babylonian trait already gives one.
Greek Odeon and vanilla Theatre fixes

Changed the Theatre icon to something else and
Gave the Odeon the same Great Work slot as the Theatre
Lake Victoria is now passable
Cargo capacity

This increases the cargo capacity in the promotions that affect cargo:
CARGO & FLIGHT_DECK
Barbarian Axman

This was apparently fixed before but somehow it has slipped back in.
README update

Also removed the upgrade to spearman for unique warrior units.
This allows more time with the UU and keeps the warrior/spearman lines
distinct.
Update CEC__End.sql

stackpointer caught this. No idea why it was changed.
Added values for ALL the new leaders

Removed the temp code.
Fixed 2 spelling errors

Leaders Maria I & Ashurbanipal
LoadedFile addition

CET_NaturalWonders is not loading for some reason.
Just added this to make it easier to check if it does.
Fixed the non-loading NaturalWonders.xml

Thanks to Stackpointer.
No duplicate elements allowed in the database code.
Fixed the Folkskola yield errors

Now provides the same yields as a Public School along with a 5% boost to
the Great Scientist beaker count
Pre-merge commit

Various edits over the last month