[ui2] Gallery sequence initialization problem

[gwhitney]

In ui2 at the moment, when I click on "Gallery" in the top bar, the Gallery page opens up but three of the options (Latticework, Residue Rise, and Chaos Game) list their sequence as "uninitialized random integers". At a quick guess, there's some kind of race condition between the sequence initializing and those subheadings being displayed (after all, the thumbnails are running fine, so the sequence must be initialized before that happens).

[gwhitney]

All Gallery items are now showing their proper sequence descriptions in ui2, thanks to #420. Closing.