Merge Develop into Master

See merge request !2

Fixed various issues involving reaction ids, corrected knockdown flux reduction (to be tested), added support for Human1 in create_table

Added support for calculating flux on reactions other than exchange reactions, removed biomass reactions in the reactions to calculate flux for, added fix for reducing flux instead of KO

Added option to reduce flux instead of fully KOing reactions, updated R test files, updated R script, updated README, fixed create_KO_lists

Created simpler R script for generating heatmaps from FVA results | Added metabolite ID vs name as an option

Develop

See merge request !1