The new option will be used to fix/optimize
propagation of parameters in the NEO SR.

as datanotebook business template is now hosted there.

/reviewed-on !605

  It can be used for scalability test.

Fix nextcloud backup cron frequency
Fix apache graceful script path

this partially reverts ba52eead

Numpy version 1.16.4 was not compatible with scipy 0.19.0

Since the addition of `set -e`, several parts of the script became dead code.

This allows much better understanding for long running Kedifa processes.

also cleanup old unused versions

- Upgrade PHP to version 7.3 and add more  required extensions
- Use mariadb from stack/erp5 because we won't code again all feature done there for mariadb, initialization and backup to have it up-to-date.
- Delete old files which are not used anymore
- Remove integrated resilience scripts, resilience will works with webrunner which is more stable today.
- Add Nextcloud software release with some script for auto configuration.

/reviewed-on nexedi/slapos!602

   It prevents things skip offline control.