chg: format, types
fix: memory allocation off by 1 (nRegister)
memset 0 the input to the signal handler. valgrind wasn't happy
add assumes to prevent accidental use of mor than 8 StringSetS or too
many StringEndS'es
fix: minbase does not work for rings as coefficient
Merge pull request #537 from mmklee/factory_emsg

Factory emsg
fix: syntax of debug version (factory/cf_factor.cc)
fix: segfault in > 2 Variable case
chg: use primitive psr gcd
chg: make modular resultant public
chg: use modular resultant in alg_factor
chg: use factory factorization in alg_factor
chg: added function to determine multiplicity of factors
chg: added two new psqr functions
chg: added QuasiInverse over alg. function field
chg: added evaluation function that keeps poly integral
fix: simpleextension
fix: handling of SW_RATIONAL in myfitting
chg: added 'subst' to substitute alg. variables in f by their
 image in the absolute extension
chg: separate non function field case from function field case
chg: better readability of code