Don't show maritime boundary labels

[kylebarron]

I think the maritime boundary lines are confusing, because most people don't think of/care about where international waters start.

The boundary layer has a maritime key, that's 1 if true.

[kylebarron]

The problem is that maritime is also true over lakes and non-ocean bodies of water. So if you turn off the boundaries over water you see this:

[kylebarron]

Instead of this: