[coverity] add move constructor/assignment op to crs matrix
[coverity] add move constructor/assignment op to crs matrix

dondieselkopf/amgcl,dondieselkopf/amgcl,ddemidov/amgcl,ddemidov/amgcl,ddemidov/amgcl,ddemidov/amgcl,dondieselkopf/amgcl