Create hips tree with fits files.

Create a series of tasks that mimic the rgb2hips code which make
hips trees in parallel. Unlike the rgb code, this produces fits
files that are not compressed or processed other that what is
needed to create tiles.

Author: natelust

python/lsst/pipe/tasks/fits2hips/__init__.py

@@ -0,0 +1,3 @@
+from ._all_sky_hips import *
+from ._high_order_hips import *
+from ._low_order_hips import *