Add multi-term ProForma parsing/writing (chimeric +, charge /z, multi-chain //) - #118

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Dereference of a possibly null reference.

Dereference of a possibly null reference.

Dereference of a possibly null reference.

'IIsotopicDistribution.CreateChargedDistribution(int, bool)' is obsolete: 'Use CreateChargedDistribution(int charge, double chargeCarrier) instead.'

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

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