pgsql: Rename C variables in formatting.c, for clarity

Rename C variables in formatting.c, for clarity

Also add C comments. This should help future debugging of this
notorious file.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/a9c22d1480aa8e6d97a000292d05ef2b31bbde4e

Modified Files
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src/backend/utils/adt/formatting.c | 179 +++++++++++++++++++-----------------
1 file changed, 97 insertions(+), 82 deletions(-)

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