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cases.

NXRRSET (including empty) for any-query was already supported and tested.

to add in the main code for them, just confirming it also works for these
cases.

case.

to test expected list of RRsets.  This should be generally better as
explained for the same update to findTest().

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)