- db:check: add success output on clean DB
 - glpi-empty.sql: remove extra space
 - glpi-empty.sql: lowercase all types
 - glpi-empty.sql: add default values for 'timestamp not null' fields
 - glpi-empty.sql: add missing default values for tinyint
 - glpi-empty.sql: add named constraint on foreign key
 - glpi-empty.sql: remove explicit NULL on nullable columns
 - validate db:check on installation test suite