Rename sort support integer comparators for clarity

The previous names used "unsigned" for Datum-width abbreviated keys
and "signed" for 64-bit signed integers. This may have made more
sense when Datum width was platform-dependent, but commit 805c64f84
added a 32-bit unsigned variant for OIDs, so it makes even less sense
now. Rename all to be explicit about signedness and width.

Suggested-by: David Rowley <[email protected]>
Discussion: 
https://postgr.es/m/CAApHDvrNMz5ahN1x=uK9yscTogmLupfLBy-_qMW9Z+k=he5...@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/19733fa0b42caffa92463bb8a8098a40d8963d76

Modified Files
--------------
src/backend/access/gist/gistproc.c     |  2 +-
src/backend/access/nbtree/nbtcompare.c |  4 ++--
src/backend/utils/adt/bytea.c          |  4 ++--
src/backend/utils/adt/mac.c            |  4 ++--
src/backend/utils/adt/network.c        |  2 +-
src/backend/utils/adt/timestamp.c      |  2 +-
src/backend/utils/adt/uuid.c           |  4 ++--
src/backend/utils/adt/varlena.c        |  4 ++--
src/backend/utils/sort/tuplesort.c     | 12 ++++++------
src/include/utils/sortsupport.h        |  4 ++--
10 files changed, 21 insertions(+), 21 deletions(-)

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