Main improvements in this PR:

As proposed in #814 and #813:

• change the charge of mets MAM20004n, MAM20006c, MAM20018r, MAM20021i, MAM20024r, MAM20025i, MAM20026r, MAM20027i, MAM20028r, MAM20029i, MAM20030r, MAM20031i, MAM20041r, MAM20042c, MAM20043r, MAM20044c, MAM20056r, MAM20057c from 0 to -1

• remove MAM02039e in MAR01444;

• remove MAM02039r in MAR20021;

• remove MAM02039i in MAR20022;

• remove MAM02039r in MAR20023;

• remove MAM02039i in MAR20024;

• remove MAM02039r in MAR20025;

• remove MAM02039i in MAR20026;

• remove MAM02039r in MAR20027;

• remove MAM02039i in MAR20028;

• remove MAM02039r in MAR20029;

• remove MAM02039i in MAR20030;

• add MAM02039m in MAR20111 as a product;

• add MAM01422m in MAR20112 as a product;

• add MAM02039c in MAR03481 as a product;

• replace the formula of MAM01657r to "C40H65O7P2"

• replace the formula of MAM20082m from None to "C11H23N1O2S2"

• replace MAM02041x with MAM01803x in MAR08415

• replace MAM02630x with MAM01802x in MAR08415

• replace MAM02041x with MAM01803x in MAR03984

• replace MAM02630x with MAM01802x in MAR03984

• replace MAM02041x with MAM01803x in MAR12372

• replace MAM02630x with MAM01802x in MAR12372

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