Add countOverlaps-methods for GRanges,GRangesList and GRangesList,GRanges to
avoid ambiguous dispatch.


git-svn-id: https://hedgehog.fhcrc.org/bioconductor/trunk/madman/Rpacks/GenomicRanges@78217 bc3139a8-67e5-0310-9ffc-ced21a209358
Merge branch 'local-hedgehog'