Revision 1113

(1) Moved order in which snippets are assembled.  Only one preamble and one postamble are used
for a single download (also a single run of TeX). The postamble ends the document and nothing
else in the file will be read by TeX.
(2) Modified the getSetTeX and getProblemTeX subroutines to include a username (for sets)
and a user object (for problems) so that problems and sets can be made for different students.
The new identifier is the first arguement.
$self->getSetTeX($effectiveUserName, $setName);

and

$self->getProblemTeX($effectiveUser,$setName, 0, $setHeader);

It seems to work pretty well, but perhaps a bit slow still.

--Mike