Instead, replace them with standard unicode "rempalcement char":
http://en.wikipedia.org/wiki/Replacement_character#Replacement_character

By Romain and Luke.

As slapos.recipe.erp5 depends on Zope2 in order to generate Zope2 aware
scripts reuse this dependency and import needed method instead of
rewriting it.

Required utils are basename, tr and uname

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