- Add "_" prefix and add missing recursive relation for
`CommonTreeDropdown` tables
- Add "_" prefix and add missing relations handled in-code (by
`$item::cleanDBonPurge()` method or using `$forward_entity_to` property
value)
- Factorize deletion of childs and relations on item deletion
- Fix missing cleanup when deleting items:
  - costs related to deleted change,
  - changes related to deleted certificate, dc room, enclosure pdu, rack
or software license,
  - certificate items related to deleted computer, network equipement,
peripheral, printer, software license or user,
  - rss feed relation with deleted entity, group, profile or user,
  - knowbase item translation related to deleted knowbase item,
  - notification template translation related to deleted notification
template,
  - change items related to deleted pdu, rack, software license,
  - locks on objects related to deleted user,
  - costs related to deleted problem,
  - costs related to deleted project,
  - queued notifications related to deleted notification template,
  - saved search alerts related to deleted save search,
- Fix missing entity forward to information:
  - from project to project cost,
- Fix relations mapping to enable detection/transfer when deleting item
and enable check on ability to disable recursivity of an item:
  - between API client and entity,
  - between business criticities and entity,
  - between change cost and budget,
  - between budget and budget type,
  - between certificate and certificate type,
  - between certificate type and entity,
  - between change task and editor user, group and task template,
  - between change validation and user,
  - between computer antivirus and manufacturer,
  - between contract cost and budget,
  - between device and model, type, entity, location and state,
  - between document item and user,
  - between domain and entity,
  - between infocom and business criticity,
  - between generic device and generic device item,
  - between motherboard device and motherboard device item,
  - between simcard device and line,
  - between device item and location and state,
  - between operation system and achitecture, edition and kernel
version,
  - between itil solution and solution type, users and ticket followup,
  - between knowbase sub items and users,
  - between line operator and entity,
  - between line and entity, user, group, line operator, location, state
and line type,
  - between ethernet network port and network card device,
  - between fiber channel network and network car device, network port
and net point,
  - between network port and network interface,
  - between wifi network port and network card device,
  - between notepad and users,
  - between notification template and notification template translation,
  - between refused emails and mail collector,
  - between ola level and ola,
  - between ola and calendar,
  - between operation system kernel version and operating system kernel,
  - between planning recall and user,
  - between problem stask adn editor user, group and task template,
  - between profile and ticket template,
  - between rss feed profile and entity,
  - between project cost and project, budget and entity,
  - between project task and project task template,
  - between project task template and project task, project state and
project task type,
  - between queued notification and entity,
  - between rss feed and user,
  - between sla and calendar,
  - between software license type and entity,
  - between state and entity,
  - between task category and knowbase item category,
  - between task template and user and group,
  - between ticket cost and budget,
  - between ticket followup and editor user,
  - between recurrent ticket and calendar,
  - between user and auth methods,
  - between ticket task and task template, group and editor user,
  - between ticket validation and users,
- Remove obsolete relations