All Views should reduce the earliest/latest time

[miratepuffin]

Now that we have g.latest() this brings up the question of if applying a view such as subgraph/layer - should this reduce the latest/earliest time?

This is because in the case where we call say subgraph followed by latest, we can just get an empty graph

[miratepuffin]

@fabianmurariu relevant test to add

[fabianmurariu]

Still happening, however we need to talk about this as I'm unsure what's expected to happen in the higher level API