Especially with local_run

That way you can do "local_run -Wall boobank"
-Wall was previously not working at all, being passed as argv[0], and
gets quickly annoying.

Without it, sys.executable became '' and would end up confusing
some virtualenv installs.

When `$PYTHONPATH` was not set, the `local_run.py` was setting a
`$PYTHON_PATH` which was only containing the script directory. It was
blocking when trying to run another Python script which was making use
of Weboob API, as well as loading other non Python stdlib modules.
Signed-off-by: Phyks (Lucas Verney) <phyks@phyks.me>

related to e93d724e

When installing weboob in $HOME, the weboob base modules (weboob.browser...)
are installed in $HOME/.local/lib/python2.7/site-packages/... (see PEP-370).
When running weboob from the source directory with tools/local_run.sh, those
base modules are read from $HOME/.local instead of the source directory.
Passing the "-s" option to python makes it ignore $HOME/.local and read the
base modules from the source directory.
Signed-off-by: Matthieu Weber <mweber+weboob@free.fr>

python modernize.py --no-six -f libmodernize.fixes.fix_print -w

With manual fixes as the import was put always on top.

This allows running any weboob script, not only those in scripts/