Move the save form to a separate screen or pop-up in filter-preview, and perhaps show only the first ~25 lines of a dataset, with a link to show the whole thing.
Have removed breadcrumb navigation, but now there's no good way to get back to the dataset from a visualisation. Need to rethink the whole navigation, now that we've moved to Bootstrap.
Allow a user to save a filter definition, with a password for editing. That way, the original URL doesn't have to be exposed, and the share URL is shorter.
Let people define stub names for when a filter is downloaded (e.g. "somalia-3w-sectors"). This can come after the hash code in the URL, to avoid collisions, and a straight ".csv" or ".json" extension on the hash can redirect to the stub (as can any wrong stub).
Instead of asking for the login when the user clicks a nav item, ask for it as needed when entering the data-edit page. That way, a saved bookmark will work, and we can simplify the markup on the other data pages and in the nav menu.
Requires adding the relative URL path so that the validator can load a relatively-referenced taxonomy; or, alternately, simply abandoning relative referencing.
Typing e.g. "country" into the tag field of the Add filter adds "country" instead of "#country" as the hashtag. This could be a problem in other single-tag fields as well.