Input widget with separate fields for Degrees, Minutes Seconds

I've put together another input widget for Geofield that allows latitude and longitude values to be entered into separate fields for Degrees, Minutes and Seconds (DMS). Is this something that could be a useful addition to the module?

Example inputs:

It allows the Seconds field to be disabled optionally, and also provides a Degrees Minutes formatter which hides the separate Seconds value, incorporating them into the Minutes as a decimal value.

The patch also allows the coordinates 0,0 to be used for both the existing lat/lon input widget and for the new DMS lat/lon input widget.

Note also the separate, related issue (#2142071: Allowing coordinate entry in degrees-minutes-seconds DMS format) for being able to enter DMS coordinates into the standard lat/lon widget, which doesn't seem to work at the moment.