change mod for numbers to mod for bigint, p5
Pfister: 3 fixes for genus/primdec
Doxygen / BS
Added /doxy shell script to the source distribution
fix: more bigint instead of number
chg: more checks for one to one correspondence of bi. factors and multi. factors
fix: need to map down co-factors
fix: need to check for divisibility
fix: wrong choice of main variable
fix: prevent factors from being reordered
fix: qsort_r

qsort_r is non-standard, esp. BSD and (newer) LINUX define it differently.
At least one has to test for it (testing OS is not enough).
chg: old comments -> doxygen
chg: more old comments -> doxygen
chg: more docu changes
chg: more consistent nomenclature
fix some wrong latex
chg: docu of NTLconvert -> doxygen
chg: better docu for absFactorize
fix: %H in help.cnf
fix: typo