Add revision to column heads. Patch courtesy of Sebastian Redl.

[SVN r39477]

tools/regression/xsl_reports/xsl/v2/common.xsl

@@ -462,6 +462,16 @@ http://www.boost.org/LICENSE_1_0.txt)
             <td colspan="{$colspan}">&#160;</td>
         </tr>
 
+        <tr>
+            <td colspan="{$colspan}">&#160;</td>
+            <xsl:for-each select="$run_toolsets//runs/run[ count(toolset) > 0 ]">
+                <td colspan="{count(toolset)}" class="revision">
+                    rev <xsl:value-of select="@revision"/>
+                </td>
+            </xsl:for-each>
+            <td colspan="{$colspan}">&#160;</td>
+        </tr>
+
         <tr>
             <td colspan="{$colspan}">&#160;</td>
             <xsl:for-each select="$run_toolsets//runs/run[ count(toolset) > 0 ]">