`cmr/dec.h` API cannot distinguish `CMR_DEC_IRREGULAR`, `CMR_DEC_UNKNOWN`, `CMR_DEC_SERIES_PARALLEL`

[mkoeppe]

Needed for https://github.com/mkoeppe/sage/blob/cmr/src/sage/matrix/seymour_decomposition.pyx#L291

[discopt]

I guess you mean that there should be CMRdec* functions that indicates whether, e.g., we have a series-parallel node?!

[mkoeppe]

Yes