Improved arrowhead scaling.
More robust elementallyBalancedQ.
More robust handling or rest groups in formula2elementalComposition.
complementParameters does not choke on parameter lists that don't contain any rate or equilibrium constants anymore.
Draw all availabe bigg maps conveniently using for example drawPathway["iMM904_COMBINED", ...]
Merge pull request #24 from SBRG/devel

Improved pathway visualization