Merge the astro-pipeline repository, history intact

# Conflicts:
#	.gitignore

.gitignore

@@ -1,6 +1,28 @@
-# local scratch and secrets
+# Local scratch and secrets
 *.token
 *.key
 scratch/
 Thumbs.db
 .DS_Store
+
+__pycache__/
+*.pyc
+
+# Image data never lives in this repo. Sessions are held on disk and located
+# at runtime through ASTRO_SESSION; a single FITS frame is 61 MB and a session
+# is several GB.
+*.fit
+*.fits
+*.tif
+*.tiff
+*.npz
+*.npy
+
+# Rendered images are session outputs too, with one exception: figures that
+# belong to the documentation. Those live under docs/ and are committed
+# deliberately.
+*.png
+*.jpg
+*.jpeg
+!docs/**/*.png
+!docs/**/*.jpg