BEAUti allow tree not to be estimated. closes #523
BEAUti allow tree not to be estimated. closes #523

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