Weight all objective residuals by area element

[f0uriest]

Some objectives (like force) properly weight by the area/volume element but this isn't true for many of the others (such as geometry, QS error etc), which can allow the optimizer to "cheat" by stretching and compressing things in areas of low/high error

[dpanici]

Must also update objective units when this weighting is added

[dpanici]

Easy for target=0 case