BUGFIX: make sure chain tracks all points
It looks like two bugs crept into !1187 (merged) just before it was merged.
- one is the ordering of the updates of the bounding ellipses and the MCMC length for the
LivePointMultiEllipsoidSampler
. The fix here means that thescale
attribute will update as expected withindynesty
. - the ACT tracking broke because points weren't actually being added to the chain during the loop.
I also removed an excess full ACT calculation as nothing is bigger than inf!