fix variable conflict issue in primdecint.lib
fix: compilation without NTL
Merge pull request #621 from mmklee/nontl

fix: compilation without NTL
prepare for singular 4-1: cring (currently inactive)
add: Singular/nuber2.*: handling of NUMBER2, CRING etc.
"fix" the SI==3 case in rintegers and add the missing bits in rmodulon
again
Try a short patch to keep it simple
re-stablish the Order module. Containing also a 1st draft for lattices
chg: Singular/dyn_modules/Order/singular.cc depends on SINGULAR_4_1
Fixed dyn_modules.dox
Doxygen directory deps.
Fixed Singular/iparith.inc generation/dependencies (but no plural_cmd.inc)
add bimodules.lib to doc
fix: examples and doc for bimodules.lib
fix: overflow check in subst(ideal..), #630
order of entries
tests for #630
fix for #628
added test for #628
Merge pull request #622 from mmklee/tr628

Tr628
hunting for the last bit: do not count the sign bit in mult/subst for poly