rql #1167312 code-compat with python 3.x [validation pending]

prioritynormal
typeenhancement
done in0.34.0
load5.000
load left0.000
closed by<not specified>
patch[py3k] more print_function [applied][debian] build python3 package [applied]gecode_solver: fix build for python3 [applied][py3k] work with str (and not bytes) in python 3 [applied]