Add a db-statement-timeout option for postgresql sources
Use that new option to set the statement_timeout option when creating
connections, except for maintenance operations (shell and upgrade).
Closes #2547026
Document: cubicweb-doc
Title: CubicWeb documentation
Author: Logilab
Abstract: Some base documentation for CubicWeb users and developpers
Section: Apps/Programming
Format: HTML
Index: /usr/share/doc/cubicweb-documentation/index.html
Files: /usr/share/doc/cubicweb-documentation/*.html