ObjStore::AV::QSet - index-style interface with an array representation

  my $set = ObjStore::AV::QSet->new($near, $size);

  $set->add($myobject);

  $set->remove($myobject);

Implements an API very similar to ObjStore::Index, except with an array implementation. Elements are unsorted. Add is the same as push, but <remove> scans the entire set.