Automated detection of undivided glaciers

Based on simple heuristics and OGGM's flowline algorithm, it should be possible to develop a tool able to detect glaciers that need to be divided.

For example:
- is the max elevation of a glacier on the outline of far into the geometry?
- do the centerlines have to up glacier?
- etc.

Having a flag in the RGI tagging potentially "undivided" geometries would be quite useful... 