Fix Sodium Cotransport GPRs

[Devlin-Moyer]

Main improvements in this PR:

Implements changes proposed in #569:

• Removes MAR05310 for being a partial duplicate of MAR06380 but with the wrong stoichiometry
• Merges annotations for MAR05310 in model/reactions.tsv with annotations for MAR06380
• Changes GPR of MAR06380 to ENSG00000017483 or ENSG00000188338
• Makes MAR06380 reversible
• Removes MAR09887

I hereby confirm that I have:

• Tested my code on my own computer for running the model
• Selected develop as a target branch
• Any removed reactions and metabolites have been moved to the corresponding deprecated identifier lists

[haowang-bioinfo]

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