Added a generate_fill.py script for fill generation, and started
a compositor.py script for final composition of caravel layout,
seal ring, and generated fill.
diff --git a/scripts/compositor.py b/scripts/compositor.py
new file mode 100644
index 0000000..3d96ca4
--- /dev/null
+++ b/scripts/compositor.py
@@ -0,0 +1,5 @@
+#!/bin/env python3
+#
+# compository.py ---
+#
+#    Final composition.  Combine the caravel top level, seal ring, and fill.