fast data loading with binary copy
pgcopy was written by Aryeh Leib Taurog @altaurog with contributions from
Igor Mastak @mastak
Marcin Gozdalik @gozdal
John A. Bachman @johnbachman
Akshaye Shenoi @akshayeshenoi
Nathan Glover @nathanglover
William Burklund @wburklund