New attributes in the manufacture section of the ruleset: producedItem & produceQty

For the sake of moddability.

producedItem: The name of the produced item (it equals to name attrib if not specified, and by default)
produceQty: The (output) number of objects to manufacture instead of one (it equals to 1 if not specified, and by default)

With these two new attributes for example we can create manufacture rules to convert 1 piece Heavy Plasma Clip to 3 pieces of Elerium-115. (that clip is assembled of 3 pieces of elerium)
Sample ruleset file for this clips -> elerium conversion can be found here: http://openxcom.org/forum/index.php/topic,1623.msg15818.html#msg15818