NH-3638: Use real equality instead of hash code for PropertyPath equality. Running the test code in NH-3638 demonstrates that the bug disappears with this change. No unit test committed since reproduction requires relatively complex long-running scenario.
Prepare 3.3.4.GA. Slight formatting in PropertyPath.cs.
GaRelease.bat: Build nuget packages at the same time.
Merge branch '3.3.x' into 3.4.x