LP#827442 Z39.50 will split the total cap between locations when multiple locations selected

This code does a bit of oversampling, and buffers the results so that a
full batch of results are returned.

In addition, the values in the hover text under "Displaying xxx of yyy records"
has been repaired, as it was easily confused.

Signed-off-by: Dan Pearl <dpearl@cwmars.org>
Signed-off-by: Jason Stephenson <jstephenson@mvlc.org>