Updates to packaging

[jsturdy]

Description

Few tweaks based on feedback of current packaged files

• Add packageFiles4Docker.py to built packages (cf. #104)
• Update imports syntax in anautilities
• Not addressing #102, as a better pythonic solution should be preferred (e.g., utilize the entry_points feature of setuptools), which requires more thought and changes
• Add a requirements-dev.txt file for the minimum necessary dependencies to be able to build the package (pip install -r requirements-dev.txt into your development virtualenv, or pip install --user -r requirements-dev.txt into your user area)

How Has This Been Tested?

Update to anautilities has not been, but is a semantic change only, a proof-of-principle of proper relative imports that will be extended to other package specific modules (where appropriate, e.g., not in tools that utilize a __main__). The other update is non-functionality change.

[jsturdy]

Added also updated gembuild submodule for pip-only make targets for building/developing inside a virtualenv