[dataimport] remove replace_sep parameter from massive store
It is unused since changeset efbbf1e93a04 "[dataimport] Properly escape
strings sent to COPY FROM"
Document: cubicweb-doc
Title: CubicWeb documentation
Author: Logilab
Abstract: Some base documentation for CubicWeb users and developpers
Section: Apps/Programming
Format: HTML
Index: /usr/share/doc/cubicweb-documentation/index.html
Files: /usr/share/doc/cubicweb-documentation/*.html