snapshot - src: Fixing FastRefresh for oracle.

Log Message:
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Fixing FastRefresh for oracle.
Disabling warnings when testing for snapshotLog presence.

Modified Files:
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src/pl:
performFastRefresh.pl (r1.7 -> r1.8)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/snapshot/src/pl/performFastRefresh.pl.diff?r1=1.7&r2=1.8)
snapshotLogExists.pl (r1.2 -> r1.3)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/snapshot/src/pl/snapshotLogExists.pl.diff?r1=1.2&r2=1.3)