There are so many possible installation paths for Python modules, it has
been very hard to even find and test them all. This adds a fallback option
if the examples dir cannot be found. A repo can work without an icon or
the example config.py.
This removes the fake assumption that the icon can be a full path in the
config.py. While the path was being properly passed through to the index
file, the file was never copied properly into place nor rsynced to the web
server.
Back when fdroidserver was built around aapt, that was needed to
guarantee that a compatible version of aapt was used. Now, aapt is
only optionally used for getting the APK ID, so this was just
complicating maintenance.
