removed idfilter and ifile mechanism in _store_seqlen_dict.
removed idfilter and ifile mechanism in _store_seqlen_dict.

ctb/pygr,GenDataPro/pygr,cjlee112/pygr,RitwikGupta/pygr,GenDataPro/pygr,ctb/pygr,theoryno3/pygr,theoryno3/pygr,RitwikGupta/pygr,ctb/pygr,ctb/pygr,cjlee112/pygr,cjlee112/pygr,GenDataPro/pygr,ctb/pygr,RitwikGupta/pygr,cjlee112/pygr,theoryno3/pygr