In DM-22698, DM-23094, and DM-22461 we incorporated Doxygen builds for Pipelines docs directly into Documenteer, migrating away from our dependency on sconsUtils and lsstDoxygen. This included consolidating the Doxygen configuration, while still allowing individual packages a limited vocabulary of Doxygen configuration tags to include or exclude specific paths from the documentation.

We've discovered, though, that the base package actually plays a special role in providing configuration defaults beyond those coded into sconsUtils.

Thus in this ticket we will port base's configurations into documenteer and expand documenteer's Doxygen configuration facility to handle these new tags.