Additional protection to avoid StackOverflow if API is incorrectly initialized. Failure to get a default session now reports to the System.out that no session is available.

Started addition of org.openntf.domino.designer plugin so we can start adding Designer-based capabilities, like modifying the Agent editor to allow inclusion of NSF-based Java classes.
Merge commit '322edf61fb3b81f8548255c76dafbcaa2114d682' into paul