Authentication Agent:
1. The standalone Authentication Agent application no longer persists cookies by default. To enable cookie persistence (per process launch), pass the argument `--cookie-persistence` on the command line when launching the application.
2. The standalone Authentication Agent application will no longer automatically scale up on high DPI displays.
3. Installing `deriva-qt` from source now requires that PyQt5 (including PyQt WebEngine) be installed manually, as a prerequisite step. Please note that if building from source, `deriva-qt` requires Python 3.5 as a minimum Python version. On Linux systems, this should be done using the OS package manager, e.g., `yum`, `dnf`, `apt-get`. Mac and Windows users should generally be able to install via pip, e.g., `pip install PyQt5`.