add getter in TreeLikelihood #880
add getter in TreeLikelihood #880

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