eMoflon::IBeX 2.0: parametrized patterns/rules only work with `api.getGTEngine().setAlwaysUpdatePrior(true);`

[maxkratz]

At least in some cases, parametrized patterns/rules do not work as expected unless api.getGTEngine().setAlwaysUpdatePrior(true); is set.

Example rule:

rule findItemByName(name: EString) {
	[=] recipe: Recipe {
		[=] -item -> items
	}

	[=] items: Item {
	}
	[#] items.name == parameter.name;
};

If there is an element in the model, that is of type Item and has the name abc, this assert fails:

[...]
assertEquals(1, api.findItemByName("abc").countMatches());

On the other hand, this assert succeeds:

[...]
api.getGTEngine().setAlwaysUpdatePrior(true);
assertEquals(1, api.findItemByName("Flour").countMatches());