Guardian core upgraded again with additional patch to further address issues from last fix

Current version:

• guardian r1450

The previous upgrade to r1449 included a patch to throw errors if any other internal state inconsistencies (like that which caused the "double main()" bug) are detected.  The errors encountered since Friday are from failures of these internal consistency checks, apparently from situations not fully covered in the battery of unit tests. This patch covers those situations. I'm looking into improvements to the unit tests to cover more of the user phase space.

No nodes have been restarted.