added gridfiledeterminertest
Revert "added gridfiledeterminertest"

This reverts commit 4e7aea3f96236360b34c25226fa1e254a80731e3.
Revert "Revert "added gridfiledeterminertest""

This reverts commit 44b3ae1e60b4a04486bd2b4a7916e190b9650c32.
removed ~ files
added args to test
prune test works
contour pruner tests work