Add
* **m2m_analysis**: optimal solutions enumeration, graph representation and compression into a powergraph.
* padmet creation after Pathway Tools reconstruction (wtih -p argument for m2m recon and workflow).
* statistics on genes/reactions/compounds in GSM after the reconstruction.
Fix
* miscoto and clyngor memory issue with solutions enumeration.
Update
* readthedocs by adding m2m_analysis.