chg: get rid of PrimePowerDomain
chg: deleted unused getmpi
removed isSqrFree
chg: keep exponents positive in convex dense (de)compression
chg: disable asserts
chg: use NTL/FLINT in *=
fix: segfault in ezgcd
chg: added test for segfault in ezgcd
fix: format
fix: make check test of factory without Singular
fix: standalone build of factory
chg: use NTL/FLINT also in operator /=
chg: update test results for Short/factorizeQ_s.tst
Merge pull request #531 from mmklee/factory_noPP

Factory no pp
update HOWTO for libsingular