update FindMemoryHoles howto
chg: simplify jjTYPEOF
Merge pull request #535 from surface-smoothers/update.memoryholes.HOWTO

update FindMemoryHoles howto
Merge pull request #536 from mmklee/factory_noPP

Factory no pp
add: description for StringSetS/..StringEndS, SPrintStart/SPrintEnd
fix: attribute for newstruct (tr.585)
improved error description when NTL is missing
Update cf_factor.cc

corrected spelling
chg: better assertions in factorize and deletion of SW_USE_NTL
chg: deleted SW_USE_NTL from cf_switches and misc_ip
chg: deleted SW_USE_NTL_GCD_*