Use a:iter instead of for loops for sulfur generation (#423)

HybridDog

2018-07-16 6af0376c23e000b7e2cd4db2659ff5d632c4e60b

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RealBadAngel <maciej.kasatkin@o2.pl> <mk@realbadangel.pl>
Vanessa Ezekowitz <vanessaezekowitz@gmail.com>
Vanessa Ezekowitz <vanessaezekowitz@gmail.com> <vanessa@rainbird.(none)>
kaeza <kaeza@users.sf.net> Diego Martínez <kaeza@users.sf.net>