Added undo trail, and initial version of column adding model browser
Fixes related to positioning and trails
Added preliminary support for separate filter display.

Have filter information displayed in own dropdown. Also indicate
filter status using colored icon.
Export the list appender.
Handle appending to lists with outer joins.
Stopped treating every columns summary as a pie-chart.
Better display of constraints
Much better functioning of filter dialogues.
Improved space management on small screens
Better space usage for query trail.

By now living in a drop-down, we have much better
space utilization, at the obvious expense of visibility
and consistency with the previous implementation and
other similar systems (eg. nautilus' bread-crumbs).
Better alignment of elements within history.
Support for a page size selector.
Handle all a little better.
Manage the custom page sizes.
Better filter editing, including typeahead.
Made filter editing sane, now with extra MVC!

Stopped using inputs as a proxy for actually having a model.
Not build up a model of the new constraint as we go...
Better suggestions when editing constraints.

Now we ignore the current constraint value when providing
contextual suggestions on the currently edited constraints.
Clean up typeaheads when we are done with them.
Better display of active constraint labels.
better layout of constraint editing forms.