cleanup internal forms parameters in postlogin

grmmbl, bad resolve

missed conflict

backport lost stable head

fix sync_schema_props_perms test

fix create_user function introduced in d6ae30c5d055 for database initialization: messup admin user groups when anon is created due to missing restriction

3.6 api update

fix unittest_hooks: attributes have now update_permission instead of [add/delete]_permission

when modifying a persistent schema, erschema may miss some permissions which wil trigger a key error, but we don't want to crash on such cases

fix #694445: related entity generates weird RQL which in turn generates weird SQL which fails on SQL Server quick fix to reuse modification_date if already retreived by the rql query.

fix 4626:c26b4df9fc90 (#703911): use can't rely on peid since it's not an actual eid when we're creating the parent entity

[form fields] nicer behaviour of the password field: don't put internal field value on edition (triggering validation error if one validation without removing the value, due to confirmation mismatch), and don't show the field as required in such case

minor cleanup: don't use builtin 'id' as variable name

[forms/inline] fix #703911: add new link disappears if inline box removed. Since we've the information, we must specify the target type else we get random cardinality on ambiguous relations

this is not the form renderer responsability to check for update permissions. Move this to autoform editable_attributes relation