fix: ssi: qring+extRing
better error message: access object from other rings in newstruct
removed currQuotient
fix: tests for "removed currQuotient"/modstd
fix: tr.616 (#include)
chg: feVoices: kernel/structs.h ->Singular/fevoices.h
chg: nNeg -> nInpNeg, also n_InpNeg, cfInpNeg
add: requirement for contributed libs
fix: ssi: sending OrdSgn==-1
fix: handle lists correctly in modular.lib

(cherry picked from commit ac96cef11e4341326c51834000ea40c735afff39)
Signed-off-by: Andreas Steenpass <steenpass@mathematik.uni-kl.de>
base modstd.lib on modular.lib

(cherry picked from commit 5ec123fda2041b4cace52475654a231bc4c8adaa)
Signed-off-by: Andreas Steenpass <steenpass@mathematik.uni-kl.de>

Conflicts:
	Singular/LIB/modstd.lib
add: tests for modstd.lib

(cherry picked from commit ea214dec3a1e971fa30dee982acbda44c9a04c7c)
Signed-off-by: Andreas Steenpass <steenpass@mathematik.uni-kl.de>
add: reuse procs from old modstd.lib for backward compatibility

(cherry picked from commit eaf62cabb61187a481212e68709ca3d5592c08ec)
Signed-off-by: Andreas Steenpass <steenpass@mathematik.uni-kl.de>
chg: update tests for new modstd.lib