fif inlined relation forms pb w/ new ajax forms.
We've to ensure the varmaker is properly initialized when generating
a form where we may add new subentities, which will use ajax call to
generate the subform while this subform expect a varmaker to be set.
# type attribute might already be there if migrating from
# version < 3.5 to version >= 3.5.3, BaseTransition being added
# in bootstrap_migration
if versions_map['cubicweb'][0] >= (3, 5, 0):
add_attribute('BaseTransition', 'type')
sync_schema_props_perms('state_of')
sync_schema_props_perms('transition_of')