use reutils as backend for the NCBI EUtils; reduce dependencies on rmisc; remove dependency on biofiles
control connection to a taxonomy database via a global option 'ncbi.taxonomy.path'; some new documentation
More documentation
safeguard for empty table lists in validity methods for TaxonDBconnection and GeneidDBConnection
remove dependency on rmisc; use reference classes as a for taxon.db and geneid.db connections; refactor db queries