ChainComplex.cpp

Small update on reduceComplex and coreduceComplex methods to correspond current
insight of reduction and coreduction: coreduction is the same thing to the dual
cell complex as reduction is to the primal cell complex, and hence has no
"priviledges" over that.

When coreduction is applied to primal complex, we obtain the thick cuts
of generators of homology groups obtained via reduction of the primal
complex.