Get some very basic things working.
First crack at alternate xticks layouts.
Get rid of units_inherited.
Reimplement Guide.yticks, Guide.ylabel with multiple layouts.
Reimplement mouseover effect.
WIP (re)implementing zooming and panning.
Finish implementing panning.
WIP: zoom/pan
Working pan/zoom.
Improve performance of panning/zooming.
Fix some layout issues. Etc.
Color keys wrap to multiple columns when needed.
Geom.bar rendering. Faster zoom/pan.
Finish reimplementing bar geometry.
Reimplement Geom.boxplot
Reimplement Guide.title
Update Geom.label.
Update Geom.ribbon.
Update Geom.errorbar.
Reimplement continuous color keys.