SysBioChalmers/Human-GEM: Human 1.8.0

Main improvements in this PR: Style/Features (PR #270): replace rxns and mets fields in Human-GEM and annotation tsv files with respective MA ids, as planned in #265 regenerate metsNoComp column from MA met ids Fixes (PR #263): fix bug reported in #262, by removing quotes from spontaneous column in reactions.tsv add structure information of annotation tsv files to README Add test to the type of spontaneous in sanityCheck Fixes (PR #261): modify the subsystem annotation for the exchange reactions found in #255, by changing from Miscellaneous to Exchange/demand reactions Features (PR #258): add new reaction HMR_10133 of taurine synthesis from oxygenation of hypotaurine, as discussed in #257 the existing HMR_8759 and HMR_3911 appear to be infeasible and therefore are blocked (ub = lb = 0). Fixes (PR #254): reformat field rxnReferences by consistently using pmids: remove uniprot ids remove omim ids remove hmdb ids use only pmids format the field as PMID:\d+ and separate multiple values by ; highlight broken references by having the field start with ?? Features (PR #251): update fetch_ensembl_gene_annotations.py script so that gene annotationgenes.tsv file can be directly generated as defined in #157 Features (PR #244): add more annotation features geneNames and geneAliases for gene