Fixed bug in how the least-squares slopes in plateauCheck were shifted to look ahead, not behind.
Deal with the case where we converge within the damping phase.
Merge branch 'development' into feature-plateau-tweaks
Merge remote-tracking branch 'chebfun/hotfix-Newton-damping-success' into feature-plateau-tweaks
Merge remote-tracking branch 'chebfun/development' into feature-plateau-tweaks
Merge branch 'development' of github.com:chebfun/chebfun into feature-plateau-tweaks
Merge branch 'development' into feature-plateau-tweaks
Merge branch 'feature-plateau-tweaks' of github.com:chebfun/chebfun into feature-plateau-tweaks