Don't fail when pyc files in /usr/lib can't be removed sasview tries to open local_config.py using load_module_from_path() but local_config.py(c) will be in a read-only location in /usr/lib so this fails.
Set library location to pick up precompiled models models can be precompiled or compiled just-in-time; for a binary distribution such as Debian, it makes sense to precompile the models and ship them in the package.
