removed dependency of subclasses to instance variable isTreeScaler by creating a protected method to provide that information.
removed dependency of subclasses to instance variable isTreeScaler by creating a protected method to provide that information.

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