backport oldstable

backport stable

fix _set_relation when no target eids, update datafeed source pull_data arguments to raise on error during tests

[session] enhance session's transaction storage handling to fix cases where commit/rollback is done while in the context of hooks_control/security_enabled managers. Closes #1412648: commit or rollback during postcreate reset hooks control state

[session] nicer local variable names

[web server] #1642893 issue a 403 instead of a 500 on Unauthorized exception To do so, we allow an arbitrary code to be passed to ``error_handler``. Default error code is still 500.

[css] repair selected slice distinctiveness (with a nice, discrete bg color)

[view] ability to define a column header through custom label_column_<colindex> method, useful for table view to customize a specific column without specifying others

[selectors] test/fix rql_condition to make it works when entity is specified via 'entity' keyword argument instead of rset, row and col

[etwist] fix bug w/ new resources concantenation and https-url enabled sites

oops

adds support for a portable db import/export format (closes: #1521112) the db-dump and db-restore cwctl commands are enhanced with a --format option (defaults to 'native'). If the format is 'portable', then the system database dump / restore is performed using pure SQL queries and the storage uses picked Python objects in a zip archive.