Retrieve user bookmarks for a neuTu user from a DVID server

Retrieve a user's bookmarks specifying an XYZ position and annotations, for a given neuTu user on a DVID server

dv_get_user_bookmarks(user, conn = NULL, ...)

Arguments

user	a user is, typically surname followed by the first letter of their first name, sometimes followed by a number
conn	optional DVID connection object (see dv_conn)
...	Additional arguments passed to dv_fetch