Consolidating RM_AA into RM_General
converted old bg classes to use rate matrix instead of glr
corrections to new ratemap implementation
Merge branch 'aa' into development
add support for Func_FreeBinary w/ new RateMap
add fnFreeBinary to RbRegister
add rev wrapper for fnFreeBinary
Merge branch 'development' of github.com:revbayes/revbayes into development