Use minutes in build history charts.

Dependencies

• [2] VBWHG272 Re-add the history tab (store size and build time), now as lazy-loaded tab on build page.

Change contents

• replacement in src/root/build-history-tab.tt at line 6
  [2.1160]→[2.1160:1207](∅→∅)
  − <h3>Build time history (in seconds)</h3>
  [2.1160]

  [2.1207]
  + <h3>Build time history (in minutes)</h3>
• replacement in src/root/build-history-tab.tt at line 18
  [2.1781]→[2.1781:1883](∅→∅)
  − d.push([[% prevbuild.starttime * 1000 %],[% prevbuild.get_column('actualBuildTime') %]]);
  [2.1781]

  [2.1883]
  + d.push([[% prevbuild.starttime * 1000 %],[% prevbuild.get_column('actualBuildTime') / 60 %]]);