old2new has two methods for genind and genpop objects,
so that old adegenet objects can be retrieved and used in recent versions.## S3 method for class 'genind':
old2new(object)
## S3 method for class 'genpop':
old2new(object)$pop and $pop.names will not be
converted. These are to be coerced into a list and set in the
@other slot of the new object.