Tree View in IDLDoc Directories

[mgalloy]

It would be helpful if there was a tree view in the IDLDoc directories (produced when you view html frames on the output). A tree view would allow users that have files in many subdirectories to collapse or expand the view for quicker browsing. I suggest that the default be to show the collapsed view. I am not sure of what this would take in terms of effort, but consider it low to medium priority (i.e. it might improve efficiency some and make it nice to use, but isn't preventing users from accessing all that they need now - in my humble opinion).