v0.13.0-beta.4

• Simplify height and layout logic for smoother resize behavior
  • Fix bugs where adding/removing panels causes other panels to distory
  • Remove unused proportional_origin.* and proportional_* layout options
  • Simplify redundant or confusing config options: All panels are now assumed to have the same width (plot.width governs width, and panel.width was removed), and the height is only controlled by panel heights (removed plot.height)
• Allow match and filter behavior to use field transforms and custom operators via the new LocusZoom.MatchFunctions plugin registry
• Rename lz_highlight_match to lz_is_match to reflect the fact that matching controls more than style
• New stable_choice scale function allows autogenerating color and layout options that are the same every time page is loaded
• Remove dimensions toolbar widget, which was widely unused
• Use cached data on zoom in (this may affect custom sources that previously relied on getUrl = getCacheKey)