Left panel background is now visible in pub demo

& filter header is now aligned and includes “item count” text on by
default
showNoneCat config option: "None" category is auto-added

Default categoryTextWidth : 153 pixels (minimum)
Left panel top row is better structured in html.
None cat. listed for coauth, coauth type skips Bederson
All boolen options merged in a single facet with AND.