Changes to make olapy compatible with https://lab.nexedi.com/nexedi/slapos/merge_requests/204
- Simplify python packaging ( remove some egg dependencies that we don't need, remove some version specs that are incompatible with ERP5 stack versions )
- Patchs to serve some example content from some hardcoded data in numpy array formats.
( this MR is mostly to track / discuss the changes, we'll clean up and submit the relavant changes upstream later )