minor changes:     depth +=1 to accomodate the last CE     added kmin and lmax to mdl() args major changes:     in case all the edges out of an abstract cell can not be modled due to lack of samples, a generic pwa model is constructed.
minor changes:
    depth +=1 to accomodate the last CE
    added kmin and lmax to mdl() args
major changes:
    in case all the edges out of an abstract cell can not be modled due to lack of samples, a generic pwa model is constructed.

zutshi/S3CAMR,zutshi/S3CAMR,zutshi/S3CAMR