Hi I have just noticed that if package is using relative paths in::
setup.py data_files = ...
Then the files are installed right into /usr in case of CPython (The
exact dest is determined by sys.prefix)
So, I'm thinking it could be worthwhile to add a warning to repoman if
package is using this method as I can imagine this can be easily
overlooked when creating a new package or mostly when bumping one.
