v1.26 Feb 9th 2016 p0

All of the goodies in v1.25 plus:

• Support for deletion during resumption through the delete_extra_files - if a subsequent snapshot has fewer files than were already sent before, delete those first. This is useful for use cases like rocksdb/myrocks where after compaction some files disappear
• Dynamic ports (available ports) is now the default, you don't need to specify -start_port 0 anymore for the receiver side of wdt, if you want to revert to fixed ports, use -static_ports or set a non 0 start_port explicitly. This should make it easier for wdt transfers using pipe to connect the receiver and sender to always succeed even if another transfer is already ongoing on the same destination