TODO

========================= GUI
[x] menubar (fring,help)
    [x] refresh
    [x] save to file
    [x] select directory
    [x] show hidden files
    [x] "about" dialogue
    [x] open parent folder

[x] click on folder -> open it
[x] show busy cursor while walking dir tree
[x] do not show black backrgound when app starts up

========================= DISPLAY
[x] display total in ring center 
[ ] always render text on top
[ ] make sure that filenames are always visible
[ ] do more magic adjustments
[ ] clean gui -> renderer interface

========================= PARSING / C-PORTAGE
[ ] port pure walking function to c or c++
    [ ] check if unsigned long is long enough
    [ ] raise python errors (instead of returning None)
    [ ] catch all possible <dirent.h> errors
    
    [ ] enable threading while running c function (?)
        currently, gtk is not responsive while walking the tree.

[ ] walk remote directories (use gnomevfs?)