fromOldAdjacencyList: condense radical list [2,2] into 2

Previously, a '2' represented '{2S,2T}' which would in
turn be parsed as [2,2] for the allowed number of electrons.
We now store sorted(set(radicalElectrons)) so that
'{2S,2T,1,3Q}' will become [1,2,3] instead of [2,2,1,3]

Also changed the line wrap to make easier to read.
toAdjacencyList: multiplicity list printed without spaces.

'multiplicity [1, 2, 3]' is now 'multiplicity [1,2,3]'