fix: kronecker multiplication over Fq
fix: bug in modular multiplication over Q(a)
chg: more tests for factorization
chg: update test results
chg: earlier check for divisibility in EZGCD
chg: more tests for gcd
chg: removed/disable dead code
chg: disabled dead code
chg: disabled dead code for factorization
chg: due to removal of old factorization code
chg: disable unused variants of functions
chg: disable some matrix nonsense
chg: remove no more need fac_multivar.h from include
fix slocus bug 526(trac)
Merge pull request #474 from surface-smoothers/fix-slocus.proposal

fix slocus bug for zero ideal (see Singular-track 526)
add optionIsSet proposal
added check if an option is valid to optionIsSet
Merge pull request #457 from surface-smoothers/checkOption

proposal for checking if a certain option is set or not
 fix: cond for regularity (syResolvente): ring_cf case
fix bug in isQuotientRing test
fix: transz.ext -> alg.ext mapping