Try new preparetest.py in a private custom installer builder setup

[aaaaalbert]

I'm currently working on a git-aware version of preparetest.py. Clearly, it needs to work with the installer and demokit build scripts too.

I'll set up a local installer builder on my machine and see what code and documentation changes might be required.

Seattle wiki pages that deal with build et al. stuff:

• https://seattle.poly.edu/wiki/Local/VersionDeployment
• https://seattle.poly.edu/wiki/BaseInstallers

[aaaaalbert]

preparetest.py and make_base_installers.py look pretty good as per the current git-aware-buildscripts branch, although a few warning messages remain. These are almost exclusively related to Affix's change of file extensions in @monzum's affix-repo which I currently use for building, save for seattlelib/textops.py which has moved to seattlelib_v2/textops.py (and should be renamed to .r2py by the way).

The build file list needs to be adapted accordingly, and the main Affix repo populated with those components that we know work.