Fix corner case bug in numeric to_char().

Trailing-zero stripping applied by the FM specifier could strip zeroes
to the left of the decimal point, for a format with no digit positions
after the decimal point (such as "FM999.").

Reported and diagnosed by Marti Raudsepp, though I didn't use his patch.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/f0bedf3e456c52274995d32d4c0c8a250de5c1ca

Modified Files
--------------
src/backend/utils/adt/formatting.c    |   27 ++++++++++++++++++++-------
src/test/regress/expected/numeric.out |   18 ++++++++++++++++++
src/test/regress/sql/numeric.sql      |    4 ++++
3 files changed, 42 insertions(+), 7 deletions(-)

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Next:	From: Tom Lane	Date: 2011-09-07 21:07:51
	Subject: pgsql: Fix corner case bug in numeric to_char().
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	Subject: pgsql: Allow bcc32 and win32 batch files to compile libpq.