Rename the triangles and vertices interface size() method to return an int.

[tinevez]

Now the sizel() method returns a long. This should make it possible for a Vertices and Triangles implementation to implement a Mastodon interface.

[ctrueden]

Makes sense, better aligned with int size() of Java collections as well. My only suggestion would be to replace the places where sizel() is called and then downcasted to int, to instead use the size() method. Otherwise, no bounds checking is done in these cases, which could be error-prone. I'm approving the changes anyway though, because this is still strictly a step forward; the changes I suggest here could be done later.