[config] dumb implementation of default_instance_id on no app config since it's referenced

fix label in generated form for relations the label for object relations was incorrect, because the '_object' mangling is done on the wrong component of field.label. fix ticket 472831

typo

bits about operations (from the actual docstrings)

fixlets on the workflow chapter

merge

smallest possible change to fix #472806

provide missing image, build on local user tmp (to avoid permissions conflicts)

update chatper on permissions

Hide Workflow related entities in the schema diagram

[schema] make RQL* constraints usable w/ attributes

[session cache] ensure we're not modifying cached rset/entities, they may be used elsewhere

[entity] put cached related entities as tuple to be sure no one is modifying

[rset] new copy() method

[migration] fix bug when propagating newly inserted relation type to children classes

merge

add some notes

fix pyro-host option type

fix bug when renaming a full text indexed attribute

fix remove/do not remove action sequence (using a temp attribute instead of setting a wrong value in the resurrected hidden input)

fix #471746

[migration] when adding a new attribute with a default value, set this value on existing entities (test and fix)

oops

unicode file name

by default skip new 'footer' category

[pyro] merge pyro-id / pyro-instance-id options, put all pyro options in the same section of the configuration file

[css] fix html_tree css, selected node use the selected class

[B] urlrewite: basic patch for i18n vtitle

backport stable branch

more test