Handle NetworkError that may be thrown by MdnsPlatform::SendUdp when subnets change
TestThread: Adopt more modern locking idioms.
TestThread: Fix collision with global 'gEnv'
Replace tabs wth spaces in generated code
Improve comment
Redirect stdout + stderr in OhNetGen.  This makes builds noisier but makes it clearer when a build fails and at least gives a hint about why it failed.
Additional actions for TestBasic
Delete commented code
CppCore implementation of new TestBasic actions
Merge branch 'master' of ssh://core.linn.co.uk/home/git/ohnet
Fix for crashes in C# subnet change listeners.  See #934.