[webservices] many duplicate stationEpochs when no sta specified

[Philip Crotwell]

Hi

This URL generates a large number of duplicate <stationEpoch> elements
for each station. Oddly, if anything, including a *, is put in the
"sta" query item, then the duplicate stationEpoch elements are not
there. Deleting the timewindow also removes the duplicate entries. Not
sure, but wonder if it is picking up a stationEpoch for each channel?

http://www.iris.edu/ws/station/query?net=II&timewindow=1997-06-07%2C2011-06-07&level=sta

thanks,
Philip