Bug: Precision of mean value doesn't match the error's

[emfreund]

There are two cases I spotted, where the rounding doesn't correspond to what pdg requires:

• 4.0048 \pm 0.1072 should be rounded to 4.00 \pm 0.11, but it becomes 4.0 \pm 0.11. This only happens when the mean value would have a 0 at the end.

• 202.18 \pm 20.16 is rounded to 200 \pm 20 instead of 202 \pm 20.