added namehierarchy method
modified function mlg to take genclone
make_ade_df returns the correct hierarchies now.
modified mlg documentation.
Changed is.genclone to normal funk
beginning function for mlg class.
made subset_mlgtable work.
Fixed frustrating thing in make_ade_df
got rid of validator. Clashed with genind validator
do not need a return when calling next method.
Added conditional for genclone objects