This function downloads a copy of the gene ontology and formats it for quick
access. It can optionally check the current version and only download a new
if it supersede the current one.
Usage
getGO(mode = "force")
Arguments
mode
Either 'force' (default) or 'auto'. If 'force' the gene ontology
will get fetched no matter what. If 'auto' it will only get fetched if the
current local version is older than the one available on the net.