This change causes Doxygen to error if there are unrecognized commands, or
undocumented/incorrect parameters in documented functions. It does not require
that every function be fully documented, just that those that are do not have
errors.
Old documentation with problems was fixed to comply.
Distributed tests were failing every now and then because the test
plugin didn't implement retry's and the test server wasn't always
starting up fast enough. I fixed this by refactoring the tests to use
the real TLS plugin, which has retry logic. This required some mangling
of the configuration options, which should serve as a good reference as
well.
