Localize Storable options instead of enabling them globally

Otherwise any external code relying on the Storable defaults will be
rudely (and unsafely!) surprised if a Bio::DB::SeqFeature::Store object
is created in the same process.

I'm not sure if $forgive_me = 1 is strictly necessary, but I'm leaving
it.  It can't hurt too much and may paper over other refs which
Data::Dumper can serialize/inflate but Storable can't.
Let Data::Dumper deparse CODE refs to serialize them, just like Storable

Otherwise they are replaced by sub { "DUMMY" }.