Log Message:
-----------
Add virtual transaction IDs to CSVLOG output, so that messages coming from
the same transaction can be identified even when no regular XID was assigned.
This seems essential after addition of the lazy-XID patch. Also some
minor code cleanup in write_csvlog().

Modified Files:
--------------
pgsql/doc/src/sgml:
config.sgml (r1.148 -> r1.149)
(http://developer.postgresql.org/cvsw...1.148&r2=1.149)
pgsql/src/backend/utils/error:
elog.c (r1.196 -> r1.197)
(http://developer.postgresql.org/cvsw...1.196&r2=1.197)

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