[facet] use facet name as input name for text widget (eg has_text)
we need to ba able to distinguish between text-inputs so we can write
a widget for a single facet that uses more than one text input.
This fix consists in the diff in cubicweb.facts.js; modifications in
facet.py result from this former.
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