1.7-SNAPSHOT with changes to support newer iRods protocol versions

Fork of 1.7-SNAPSHOT(from https://github.com/msmorul/irods-api ) with changes to support newer iRods protocol versions as well as parallel multi-threaded multi-socketted downloads from iRods server.

Tested against TACC's iRods 3.3.1 https://www.tacc.utexas.edu/user-services/user-guides/irods-user-guide