Alchemy: Alembics and retorts are used in reverse
Only tested on openmw 0.40.
All 4 apparata are used (some GM, some M); the resulting potion's weight is just the arithmetic mean of the ingredients' weights.
The alembic should decrease the weight.
(RM-3574 from redmine: created on 2016-09-30 by Tele Tup, , closed on 2016-10-06 by R. D.)