add license text to all CSPP Geo GGLM code

Closes #16

gridded_glm/bin/cspp-geo-gglm-make-grids.sh

 #!/usr/bin/env bash
 # encoding: utf-8
-# Copyright (C) 2019 Space Science and Engineering Center (SSEC),
+# Copyright (C) 2019-2021 Space Science and Engineering Center (SSEC),
 #  University of Wisconsin-Madison.
 #
 #     This program is free software: you can redistribute it and/or modify