pg_lsn macro naming and type behavior revisions.

Change pg_lsn_mi so that it can return negative values when subtracting
LSNs, and clean up some perhaps ill-considered macro names.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/844a28a9dd1a48045ad1db9246da5e2783c9bd40

Modified Files
--------------
src/backend/utils/adt/pg_lsn.c       |   45 +++++++++++++++++-----------------
src/include/fmgr.h                   |    4 +--
src/include/postgres.h               |    8 +++---
src/test/regress/expected/pg_lsn.out |    6 ++++-
4 files changed, 33 insertions(+), 30 deletions(-)


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