[book - #1251197] add a section in migration page for add_cube and add_cubes command

[book - #1251780] add a section to explain how to write tests to test which actions are visible

[book - #1251260] add a warning in automatic test when user redefine the base class

should not use pyro 4

cleanups

[basecontroller] we should consume divid to avoid it being reused by the table view, leading to duplicated id (and hence weird rendering)

[basecontroller] pagination / ajax fixes

[basecontroller] handle case where the query is prefixed by 'rql:' as allowed by the search input

[repo tests] add test case for RQLUniqueConstraint

[primary view] properly handle case where view specified in pvdc['vid'] isn't selectable

[primary view] don't need to pick arbitrary target, this is properly handled by the rtag

[schema] turn comment into docstring for RQLUniqueConstraint

[schema] ensure DISTINCT is displayed for constraint using it, this ease debugging

[windows distrib] trailing slashes in MANIFEST.in breaks windows install (sic)

[schema] mark CWUniqueTogetherConstraint and its relations as schema entity/relations

[schema] mark CWUniqueTogetherConstraint and its relations as schema entity/relations