logilab-common #155138 [graph] crash under python3 when trying to write utf8 data [validation pending]

prioritynormal
typebug
done in0.60.0
load0.100
load left0.000
closed by#9e4eb6f9c594 graph: use codecs.open. Closes #155138
patchgraph: use codecs.open. Closes #155138 [applied]