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
side-by-side installation: not possible
add: overloading kernel functions (which)
chg: currRing may be set elsethere, do not reset it after last hdl is gone
overflow handling for mult
changed tests
Singular_4_1: basic cmatrix stuff
Fixed make check in kernel/GBEngine (due to static library linking)
add: comments on some unused tokens