Added checks for clustering

examples/compclustedep.C

examples/compclustsize.C

examples/compedeps.C

examples/compnclusts.C

examples/compnhits.C

examples/comprawhits.C

examples/hodtest_mkj.C

src/THcRawShowerHit.cxx

src/THcRawShowerHit.h

src/THcShower.cxx

src/THcShower.h

src/THcShowerCluster.h

src/THcShowerPlane.cxx

src/THcShowerPlane.h