WASHINGTON — One of the final sticking points standing in the way of a tentative US-Iran peace deal is the phased unfreezing of funds held by Qatar and intended for humanitarian purposes, The Post has learned. President Trump and Iranian negotiators are haggling over the final details of a memorandum of understanding that would reopen the Strait of Hormuz to international shipping while giving additional time for a second round of talks on the fate of roughly 1,000 pounds of highly enriched