Query Latency Percentile on General Activity Page

This patch will add three columns Latency Percentile(90)	Latency Percentile(95)	Latency Percentile(99) on general activity page for overall queries, select queries and write queries.

We had such requirement to see the query duration in term of percentile.

Next requirement is to show the same percentiles on Query by user page. This is first patch for one page.