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this makes the test code shorter, and perfomrs more flexible than pointer
comparison.  this is not necessarily crucial for this branch, but will
eventually be necessary when we update the internal representation of in-memory
data.  at that point returned RRset by find() will be different from the one
installed by add() wrt pointer comprison.

g++ somehow seems to require it to compile with toupper.  updated comments
about it.

in InMemoryZoneFinder::load()

Or, more precisely, avoid compilation of tests using these on systems
which don't have them.

leaving it dangling on reload.

(not mandatory to compile, but the previous position looked awkward)

As it is tightly coupled with the previous try statement.

The server is a separate entity from the developer's collective mind,
which, at last for the time being, is not considered sentient. Therefore
the word "we" is not appropriate and the server should be described in
third person.

addNXRRsetDenial() -> addNXRRsetProof()

also added a few comments to test data

combining common cases.

added some more test cases.