Turn off logging during testing

Normally, each query run against a search index is recorded in a log file. The log file data is used to generate the periodic Search Activity Report.

A new "nolog" option has been added to keep a query out of the log. This is useful, for example, when testing the search results page. It allows tests to be run without affecting the statistics on search terms. To run a search without logging, add "/nolog" to the search URL.