Athenian and Spartan Town Phase champions were a casualty of the Stoa being removed. It was a unique strategy and this patch returns it to the Athenians. It also means that the Athenian Marines will be seen on non-naval maps and give the Athenians a consistent 3rd champion option to make up for lacking cavalry champions.
This patch makes them accessible in the Barrack (mercenary achers too) and to do this the Iphicratean Reforms technology was moved from the City Phase to the Town Phase and moved from the Pyrtaneion to the Civic Center.
P.S. Another way to do this was to move the Gymnasium to the Town Phase and make the Marines trainable in there. With this, the Iphicratean Reforms tech would remain unchanged and on water maps, dock Marines would only become accessible in P3 while the Gymnasium ones would still, of course, be P2. Personally, I like this approach more but I had to have 2 Marine templates for P2 and P3 each and so Marines trained from a Gymnasium wouldn't be selected together with Marines from a Dock. If there's a solution to that issue, this implementation can also be explored.