* Make classic storyview work in new windows, too
* Make pop storyview work in new windows, too
* Make zoomin storyview insert and remove animation work in new windows, too
... this makes the animation when inserting tiddlers / navigating to tiddlers in the pop storyview less jumpy
it simply sets `overflow-x` to `hidden` for the time of the insert-animation
There are still some warnings about making functions in a loop, but
I’ll fix those as a separate pull request because the fixes are more
than typographic errors.