prevent overly long operator label names in Operators panel in BEAUti. fixes #661
prevent overly long operator label names in Operators panel in BEAUti. fixes #661

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