Enable sub-folders creation in the bookmarks manager

[#1]

Pretty self-explicit.

Thanks,

Antoine.

[#2]

If you like the above idea, you may also be interested in http://ideas.omniture.com/t5/Adobe-Idea-Exchange-for-Omniture/Group-Bookmarks-amp-Dashboar ds-by-Business-Projects-i-e-in-same/idi-p/489 :-)