Simply move from vifib_erp5 to slapos_erp5.

This bt5 is not needed as fiber request is not installed neither.

Move its code into slapos_cloud and vifib_web bt5.

There is no user for Slave Instances, so use super user instead.

New authentication ways allow to have multiple user with the same email.

This reverts commit e96ef577.

Introduce data caching and avoid re-doing modifications in case if no
important parameter changed.

The category is destination_section.

Wrong code has been "fixed".

That's why he needs access to Computer Network.

Avoid playing directly with deliveries and reuse direct linking between
Software Installation and Computer.

Also move out error reporting from Computer to Software Installation.

It will be used during allocation.

Respond immediately with no data in case of no cached information and register
cache filling.

In case if data are available, but older then 5 minutes, request its
recalculation.

Of course, this is bad...