VERSION 1.1.10: minor managed route fixes

Version 1.1.10 is a minor bug fix release. It fixes the following two issues:

 * Routes are no longer added 'via' IP addresses of the current node's ZT interface.
 * IPv6 default route is now fixed on Mac.
 * IP addresses are now deleted before new ones are added to allow changes to netmask
   on Mac and some other platforms.

This version also quietly introduces a feature called trusted paths. We'll be
documenting this in our community section soon. This is an experimental feature
for in-LAN SDN use.