Significant changes:
* Convert back from POSIX to Python [1]
* Quote $PATH export to account for spaces
* Install nano source syntax highlighters
* Install the sqlite3 shell
* Look for an R bin directory and add it to the PATH
* Add a README and COPYING metadata
* Add --verbose and --version options
[1]: https://github.com/swcarpentry/bc/issues/424
-Subproject commit 7eebf0d1c727845422fb2786ae6a08588990033e
+Subproject commit b5d30369caed1670aad13a55ec24a2429affc6e2