setup: make runnable from other dirs
Currently it fails when run in that way for two reasons:
- the description is loaded from the README file but with a path relative to
the working directory
- module references have the same issue, which is fixed with package_dir.
#require test-repo pyflakes
Copied from Mercurial core (60ee2593a270)
$ cd "`dirname "$TESTDIR"`"
run pyflakes on all tracked files ending in .py or without a file ending
(skipping binary file random-seed)
$ hg locate -I 'set:(**.py or grep("^#!.*python")) - removed()' 2>/dev/null \
> | xargs pyflakes 2>/dev/null