The Kushite "Divine Instruction" (`upgrade_rank_elite_healer.json`) technology is very expensive (500 stone for the structure that researches it, 500 food + 500 metal for the technology itself) and not very useful (few players actually train healers).
This patch deletes that technology, and instead makes elite healers trainable by default at the Amun temple, and lets Kushites start with an advanced healer on random maps.
[EDIT] This patch also makes the Amun temple somewhat stronger, to reflect its size (it's larger than some wonders) and its build limit of 1.