Revision 993

Made small modifications to allow Problem.pm to read a problem that has
not yet been assigned.

 TO DO (and I'll need help with this)
Convert a global set to a global user set (and the global problem to a
global user problem).  I need to know how to specify the appropriate
classes.

Once we are guaranteed a record of the type returned by getGlobalUser
....

stuff missing defaults (e.g. psvn for set, and num_correct (answers) for
problem) in the newly created global_user record objects.(this part I
can do.)

At that point the rest of Problem.pm should be able to proceed as before
without any changes.

--Mike