accessions and study URL updated
accessions and study URL updated

I added the study accession and URL to the text and the accession for the read data sets to the table
metagenomics/2015-biogas-cebitec,metagenomics/2015-biogas-cebitec,pditommaso/2015-biogas-cebitec,pditommaso/2015-biogas-cebitec,hjanime/2015-biogas-cebitec,hjanime/2015-biogas-cebitec