This commit corrects the ordering to the one in
Gramps 5.1 when run on Python 3.3.
Unlike the implementation in 5.1, this
implementation does not rely on dict ordering
and will therefore be consistent across Python
versions.
The assumed order of ascending positives followed
by negatives in reverse order, was based on tests
run on Python 3.7. However, the current ordering
in Gramps 5.1 is depended on dict ordering which
has changed between Python versions.
The expected ordering is therefore taken as the
one in Gramps 5.1 run on Python 3.3, which is
what the CI environment tests on.
This ordering is positives followed by negatives
both in ascending order.
I.e. -2, -3, -1, 0, 1, 2, 3, 4, 5
=> 0, 1, 2, 3, 4, 5, -1, -2, -3
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