build: 0.4.3-2
Base.download_packages() must not assume self.progress exists.

Base can only see it when dnf runs from the command line but not otherwise.
fix: install does not report file conflicts (RhBug:1017278)
Resetting base.goal.
Improve error reporting in hdrFromPackage()
input function in dnf.i18n renamed to ucd_input to avoid conflicts with buildin function
basic python 3 support added.

UTs passing under both Pythons now, the main program not yet functional in
Py3.
added methods to PycompDict to fully imitate py2 dict