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so we can reuse the same data for each fixture.

added getOrigiNode() to get access to the origin node.

so I can use the LabelSequence objects in EXPECT_EQ().
also fixed a minor error in doxygen comment in equals().

right now, only simple create/destry are supported (and they are not 100% safe
yet).

not directly related to this branch, but we'll eventually need this.
the change is purely local to the domaintree.h; no need to update tests.

discussed via jabber

noted on jabber

Some review on jabber. If necessary, jelte can update later.

okayed by muks

and updated entries for style (even old entries).

since not backward incompatible or operational changes.

This is only needed so I don't have differences later.
This won't be needed once we stop including generated docs in the
source tree.

as suggested in review.
also updated getRRSIGWithRdataCount() to generate the data from write,
not from text as I found it took much longer time if I did it from text
(which is simpler).  with large number of RRSIGs it's noticeable and not
good for unittests to run frequently.

it was indeed not expected to be copyable.  making this explicit would help
prevent accidental misuse.
as suggested in review.

referring to #2066.

this will help prevent accidental direct misuse of these variables