trunk: solve Issue 523:	BEAUti Traits panel buttons enable/disable should adapt to data and traits
trunk: solve Issue 523:	BEAUti Traits panel buttons enable/disable should adapt to data and traits
JifengJiang/beast-mcmc,JifengJiang/beast-mcmc,JifengJiang/beast-mcmc,JifengJiang/beast-mcmc,JifengJiang/beast-mcmc