addPubmed: Adds number of titles from Pubmed to list
Description
addGo returns an 'mgl' list with the sixth element as the number of titles from scientific publications indexed in Pubmed that reference the gene of interest. Please note that this function is a modification of GetPubMed from the NCBI2R package written by Scott Melville and archived on CRAN (see https://ncbi2r.wordpress.com/)