sieve-dev Interface change

[Matthew Knepley]

AIX compilers will not allow 'restrict' as an id, and thus I had to change
restrict() to restrictClosure() everywhere. This is probably a better name,
since we can have other kinds of restriction, its just a pain.

  Matt

-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which
their experiments lead.
-- Norbert Wiener