Renamed the change list.  Moved labels and vectors over to new manager infrastructure.
Can now apply sub texture to just part of a drawable.  Spherical earth quad layer can now take an image type to cut down on texture memory.  The tile quad loader can be given a texture atlas size (to cut down memory use).Fixed a bug in the dynamic texture atlas for 565.  Font based label layout working better.  Found a layer view watcher edge case.
Merge branch 'develop' of git+ssh://github.com/mousebird/WhirlyGlobe into develop
Switched the chunks over to a manager.