hamlib: update to 3.1

Version 3.1
2016-12-31
* Fix kenwood_set_mode for ts590s and mode CW, RTTY or AM.
  Tks Tom, DL1JBE
* Proper IPV6 and dual stack networking. Bill, G4WJS
* Add a new command line option '--no-restore-ai' ('-n') to rigctl.
  Bill, G4WJS
* Fix missing PKTUSB mode setting code for FT-817 & FT-897.  Bill, G4WJS
* New Prosistel rotor backend from IZ7CRX
* Install daemon man files to man1.  Nate, N0NB
* Migrate from libusb-0.1 to libusb-1.0.  Stephane, F8CFE
* Added support for Icom IC-2730.  robinolejnik
* Added support for the Icom IC-7300. Mike, W9MDB
* Add send_morse to icom rigs.  Mike, W9MDB
* added instructions how to compile on OSX. DH1TW
* New Perseus model.  Stephane, F8CFE
* Added Lua binding and demo script.  Ervin, HA2OS
* Added test to support Flex 6300.  Bill, KB4AAA
* Many bug fixes and feature enhancements to the code base.  See the
  Git commit log for complete details.

(gdt)