[RCD] Folder management drag/drop

Hi,

I finished folder drag/drop. Enables drag/dropping of folders onto a new parent folder, or to the root of the tree if dropped onto one of the 'protected' folders.

In the process I fixed sort_subscription_list(). Not that anybody ever noticed it was broken, but still.

Comments please, and tests on different browsers on different platforms. Firefox on win32 works fine, no need to test that :)

Robin

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