cubicweb-vcsfile #2758320 broken handling of non-ascii chars [validation pending]

seems like revision attributes (author, description) don't use the right charset

prioritynormal
typebug
done in1.12.2
load left0.000
closed by#dbb58c4de940 [import/mercurial] fix encoding issues for revision description and author, #2925c318a145 Force mercurial to give us utf-8 strings (closes #2758320)
patchForce mercurial to give us utf-8 strings (closes #2758320) [applied]
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