That was my thought too, seems like overwriting could cause some headaches.

Currently now trap duplicated workspace names and bad uploaded files.  Error
handling is dealt with (mostly) the same as the initial workspace selection page
(with a slight twist to deal with the hassle of frames)

ERROR reading file: msg59
Possibly a access right configuration problem.
[Errno 13] Permission denied: '/extra/trackers/sgdi/db/files/msg/0/msg59'

Need to check that the workspace name isn't already taken and handle that
properly.  Not sure if the proper thing to do is to not allow it or to overwrite
the current workspace.