hgview #100530 Unnecessary dependency on docutils [validation pending]

helpviewer use docutils.core to format help, but crashes when not finding it.
Make this coloration gracefully downgrade when docutils are not available.

prioritynormal
typebug
done in1.6.0
load0.200
load left0.000
closed by#ba0660fccbe7 closes #100530 : fix unnecessary dependency on docutils.core.