implement webapp memory limit in django
this is what we have in production:
- Webapp.memory_limit contains the size (in bytes) of the memory allocated to run a job wit this webapp (should not be null)
- at webapp creation the webapp's memory_limit is set to the default limit configured in allgo (in production it is 4GB)
- allgo admins may change this memory_limit (on a per-app basis) upon user requests