[devtools] don't hide warnings and errors during tests
The markdown module in jessie turns all warnings into logging calls, so
this allows me to still see deprecation warnings when running tests.
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