Sal Scripts 3.1.1

This release updates the sal-scripts to use python3. As such, it includes the scripting to build a relocatable python 3 that all of the sal-scripts and checkin modules use.

The Sal utils have been packaged up into a proper python package, which has been pip-installed into the included python.

If you have custom checkin modules, you need to update the shebang to use the sal-scripts python. Also, any use of what used to be imported as utils is now available by using the package name sal. In most cases, s/utils/sal/ are going to handle it, but please test!