[Shake-dev] ShakeMap bug fixes

[Peter Lombard]

Kuo-Wan,

I have found a bug in the ShakeMap program db2xml. This program is used to
query a CISN-style database to extract ground motion data and generate a
db_dig.xml file in an event input directory. Until recently this code was
probably used only at Caltech; as CISN software is being adopted by other
regional networks, db2xml will see more use.

The bug is that a regular expression so search a unit string for velocity
units like "cms" also matches the acceleration string "cmss". The result is
that psa values are being transformed incorrectly.

While I was at it, I cleaned up the code formatting and added a few
comments. Attached is the new db2xml.
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I also found some problems in two perl modules in perl/lib/Shake. Both
Event.pm and Source.pm did not handle leapseconds correctly. The CISN-style
database has provision for leapseconds, so ShakeMap needs to handle them
properly. Attached are the two modified codes.
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Finally, I modified retrieve to print out the time that it starts and
finishes. This is useful for diagnosing delays in ShakeMap.
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Hopefully these changes will make their way into any upcoming ShakeMap
release.

Pete