Assorted further cleanup for integer-conversion patch.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: d1d8462d99620cd4384d77b0908d50a49c38eb31
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2010-11-20T17:09:36Z
Releases: 9.1.0
Assorted further cleanup for integer-conversion patch.

Avoid depending on LL notation, which is likely to not work in pre-C99
compilers; don't pointlessly use INT32_MIN/INT64_MIN in code that has
the numerical value hard-wired into it anyway; remove some gratuitous
style inconsistencies between pg_ltoa and pg_lltoa; fix int2 test case
so it actually tests int2.

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