Add submodules for new core and extras subdirectories of modules, not yet live.
Modules is a package.
Update module test code to avoid pycs (that are not used)
changes for package loading of modules
Updating the module formatter to deal with the new repo structure.
Some various comments about the new repos, more to likely come.
README update
hacking/env-setup no longer needs to set library since modules appear as git submodules.
Removing legacy test dir
Docsite formatting