Contribution Search - Total Amount and Avg Amount in Search Results are Incorrect

The Total Amount and passed to the template ($total_amount - from Contribution/Form/Search.php) reflects on the rows in the current page. This causes the calculated Avg Amount to be incorrect (since it divides total_amount by total rows in result-set).

We should modify the query so that it selects SUM(civicrm_contribution.total_amount) AS search_total_amount, assign that to the tpl and modify templates/CRM/Contribute/Page/ContributionTotals.tpl to use $search_total_amount instead of $total_amount. We could also get search_avg_amount from the query, rather than doing the division in the tpl file.