added support for working with annotation slices, by using relativeSlice instead of absoluteSlice for sequences retrieved from seqlist.getSeq().
added support for working with annotation slices, by using relativeSlice
instead of absoluteSlice for sequences retrieved from seqlist.getSeq().

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