[Bf-python] Contrib Addon Review: system_project_folder

[Campbell Barton]

#####################
system_project_folder
#####################

Having a menu item just to open the current blend file in a file
browser is OK, but quite limited.
What if you want to see the path of a linked library blend, or an image?

I'm not totally against - but think it would be good to have a button
in the file selector header that opens the current path being browsed
externally, then keep the one in the file menu for convenience is ok.

-- 
- Campbell