fix: comment splitting via hnexpansion (deg problem)
add: default attrib for rings" "ring_cf": rField_is_Ring
chg: ASSUME prints current ASSUME- source line (up to 79 chars)
chg: doc. of genus: requirement for coeffcients
fix: do not use regularity with rField_is_Ring in idSyzygies
fix: cond for regularity (idSyzygies)