The images/ subdir is used to create images packages for release tags.
However, it contained a lot of code from many releases ago, prior to the
usage of the cache/ directory.
This simply removes all the old code that is no longer required for
creating release packages.
This commit makes minor changes to create_imgs_package.py to make it
Python 3-compatible, harmonizing it with the rest of the Python scripts
in UHD which have already been updated for Python 3.
- populate_images.py: Made Py3k safe
- uhdimgs.py: Make Py3k-safe
- create_imgs_package.py: Rewrote to build release images packages
- make_zip.sh: Skip CMake, just zip up the files
- Updated README to reflect all the changes
