[ENH] Explore a "two workflows" style format

[jGaboardi]

Explore a "two workflows" style format

try:
    import geopandas
    GEOPANDAS_EXTINCT = False
except ImportError:
    GEOPANDAS_EXTINCT = True

if not GEOPANDAS_EXTINCT:
    # do operations with geopandas/shapely
else:
    # do operations with libpysal.cg

related to #191

[jGaboardi]

It has become clear that this is infeasible. Closing as per #646.