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.
Make compiled models reproducible The C code for the compiled modules is generated on-the-fly, with several source files being concatenated and #line directives added to the source too. This patch makes the compiled modules reproducible by: - stripping the varying build path off the front of the filename in the #line directives so that only the relative path to the source is used. - saving the generated C source in a stable file location if it is precompiled models that are being generated rather than JIT models.
