Calculate the tree before the diagnostics.
Mix up the filtering UI a little.
Show duration.
Merge.
Fix botched merge.
Merge with upstream/master by throwing away my changes (no idea what they were).
Use treetwisty.svg again because bug 764299 has fixed the SVG perf problem. Reverts commit 505cb07f1849114fc0b43ac7a8b9d91922d2a90e.
Merge pull request #27 from mstange/hidpi-toggle

Use SVG treetwisty image again for nice HiDPI appearance