issue #306 do not optimise during burnin
issue #306 do not optimise during burnin

CompEvol/beast2,Anaphory/beast2,Anaphory/beast2,CompEvol/beast2,CompEvol/beast2,CompEvol/beast2,Anaphory/beast2,Anaphory/beast2,tgvaughan/beast2,tgvaughan/beast2,tgvaughan/beast2,tgvaughan/beast2