Make txid 64 bit, even though the high bits don't seem used
Make txid 64 bit, even though the high bits don't seem used

elog.c's interpretation looks suspicious, too, considering the
documentation suggests that the csvlog format should emit txid as a
bigint.

Signed-off-by: Daniel Farina <3d0f3b9ddcacec30c4008c5e030e6c13a478cb4f@heroku.com>

logplex/pg_logfebe,logplex/pg_logfebe