run_treemap: print treemapgen output on failure
mapfile: Force valid UTF-8
view.php: Add line-height CSS rule

This improves readability of group headers in Firefox.
view.php: Improve layout algorithm

Old logic: end a line when the average aspect ratio exceeds w:h
New logic: end a line when we can't add an item more wider than taller
view.php: Dramatic performance improvement by avoiding jQuery
view.php: Don't rely on PHP short tags
view.php: Avoid serializing entire data subtrees to JSON
view.php: Select popup content when clicking on an element
Add testsym
run_treemap.php: Windows fix
dsym: Multiple improvements