support Raspberry Pi Raspbian configure.sh
remove -j option
Merge pull request #613 from y12studio/pi-raspbian-conf

support Raspberry Pi Raspbian configure.sh
Revert "Revert PR #621"

This reverts commit d32db58bb3f693de33776229c76185d270d32a6e.
Allow non relative imports for now (W0403).
Revert "W0403: Honour relative imports."

This reverts commit bb7a9849ea8d622702fdb6c74eaf5c847cd4f570.
Do not cancel entire checksuite if pylint is absent.