New: Access "unaggregated" data from CWA ("moment-by-moment")

When users choose "moment-by-moment," the CWA and VIS output one table-like file
per input file. It's Peter's "play-by-play" thing. This requires a change that
won't be released in vis-framework until v2.1.

Closes #52
Fixed: All "alert()" calls are now "window.alert()"

I didn't realize the first is deprecated, but it is, so we won't use it.