updated MaizeGDB, MaizeGDB_QTL, and MaizeGDB_stock URL links
updated MaizeGDB, MaizeGDB_QTL, and MaizeGDB_stock URL links

geneontology/go-site,geneontology/go-site,hattrill/go-site,geneontology/go-site,hattrill/go-site,hattrill/go-site,hattrill/go-site,geneontology/go-site,geneontology/go-site,hattrill/go-site