Include text files into doxygen manual

chg: removed unnecessary C-style commenting
fix: typos in doc.
Updated Doxygen configuration to newer doxygen version
Fixed Doxygen config
removed n_IntDiv/cfIntDiv etc.
fix: gcd(bigint,bigint)
rewrite of crypto.lib: use bigint instead of number
change mod for numbers to mod for bigint, p2
doc: system("install"...) for CMD_M
change mod for numbers to mod for bigint, p3
change mod for numbers to mod for bigint, p4
change mod for numbers to mod for bigint, p5
Pfister: 3 fixes for genus/primdec
Merge branch 'spielwiese' of github.com:Singular/Sources into spielwiese
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