#1 Make width of tree panel in index.html configurable

[David I.]

See the message at:

https://sourceforge.net/forum/forum.php?thread_id=1543398&forum_id=579031

My report names for the tree panel are causing it to
scroll because they are too long for the default width.

How can I increase the width?

Firefox scrolls the panel, and IE mashes the text on
top of the tree icons.