[pygcs-devel] Whiteboard changes

[Jeff B. <jb...@sh...>]

Added ownership of whiteboard items per Klaus since we had gone
that far already.  Admin can erase all or any selected messages.
Normal users can only erase selected messages of theirs or 'wb_erase
all' which will erase all of theirs.  I didn't like the keyword
'mine' anymore since that implies that there is a way for normal
users to erase other peoples'.