[FIX] filter preceded by an invisible filter in the same group

On click on a filter in the drawer, FilterGroup would just match the
offset of the filter in the group's DOM with an index in the internal
#filters array. 

This worked until invisible fields, and then again only for filters
*preceded* by an invisible sibling in the same group: invisible
filters are not rendered in the DOM, so the indexes would get out of
sync.

Fix by using explicit indexes stored in a filter's @data-index and
using that to get the filter object/node.

An alternative fix (but hackier I think): instead of not rendering
invisible filters, render them with display: none. Remains an option
in the future if needed...

lp bug: https://launchpad.net/bugs/1157125 fixed

bzr revid: xmo@openerp.com-20130321155123-211iht7c6zme712e

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