Currently only residues_to_flows as this will be the most used interface for unwrapping arcs in EMCF
Others can be added later if needed
Also added an interface to Hop-3 graph which can be represented as a planar graph
This will allow for MCF solvers to be used with sensors like S1 where spatial baseline might not matter much and we typically just use temporal baseline to constrain the networks
Opening this PR early to gather comments on
residues_to_flowsas this will be the most used interface for unwrapping arcs in EMCF