Enforce non-CH graphs for all LocationIndex implementations

[easbar]

These calls to CHGraph#disconnect aren't doing anything and there aren't even any shortcut edges involved in this test. This has been like this since a long time, for example already in 2015, e.g. here 7f80425. Maybe we should rename the test or remove it even (is it still testing something useful) ?

[karussell]

Yeah, very old stuff. Was introduced in #30 but at that time we had two different LocationIndex implementations. One for CH and one for none-CH graphs. So probably we do not need this anymore.

[easbar]

LocationIndexTree even throws IllegalState for CH graphs in the constructor (but the other implementations do not). Maybe we can add the same check in the others as well and delete the entire test class (LocationIndexTreeCHTest) ? Location index is not related to CH at all (anymore) ?

[easbar]

Now I am throwing IllegalState for all LocationIndex implementations and deleted the LocationIndexCHTest.

[karussell]

Or maybe we remove all other LocationIndex implementations or move them into the tests? I think the only used one is the full edge index for correctness tests.

[easbar]

Or maybe we remove all other LocationIndex implementations or move them into the tests? I think the only used one is the full edge index for correctness tests.

Ok go ahead if you want, for me its sufficient to get rid of the .disconnect calls for now (I cant really judge if we should keep the other location indexes or not) :)