Backport from trunk to 8.3 of modifications on groebner/nsatz (13056-13058, 13062, 13069, 13073).
Backport from trunk to 8.3 of modifications on groebner/nsatz
(13056-13058, 13062, 13069, 13073).

git-svn-id: 44dc50bdcc0f5d1a212c497508dc9452e0b35e2b@13180 85f007b7-540e-0410-9357-904b9bb8a0f7

silene/coq,ppedrot/coq,SkySkimmer/coq,coq/coq,pirapira/coq2rust,letouzey/coq-wip,Zimmi48/coq,pirbo/coq,gares/coq,aspiwack/coq,coq/coq,ejgallego/coq,gares/coq,mattam82/coq,maximedenes/coq,TheTypoMaster/coq,herbelin/coq-hh,tomprince/coq,JasonGross/coq,Matafou/coq,Zimmi48/coq,Ptival/coq,gares/coq,JasonGross/coq,barras/coq,Lionel-Rieg/coq,amintimany/coq,jpdeplaix/coq,letouzey/coq-wip,gares/coq,silene/coq,mattam82/Coq-misc,jpdeplaix/coq,JasonGross/coq,TheTypoMaster/coq,gmalecha/coq,8l/coq,SkySkimmer/coq,shindere/coq,herbelin/github-coq,Zimmi48/coq,pirbo/coq,maximedenes/coq,jhjourdan/coq,aspiwack/coq,william-lawvere/coq,letouzey/coq-wip,Matafou/coq,asr/coq,coq/coq,gmalecha/coq,SkySkimmer/coq,shindere/coq,asr/coq,gares/coq,Ptival/coq,maximedenes/coq,shindere/coq,ale-f/coq,ppedrot/coq,JasonGross/coq,ejgallego/coq,ejgallego/coq,8l/coq,herbelin/github-coq,william-lawvere/coq,mattam82/coq,Lionel-Rieg/coq,TOSPIO/coq,aspiwack/coq,silene/coq,coq/coq,maximedenes/coq,barras/coq,william-lawvere/coq,Lionel-Rieg/coq,barras/coq,amintimany/coq,mattam82/coq,pirapira/coq2rust,jpdeplaix/coq,pirapira/coq2rust,maximedenes/coq,mlasson/coq,Matafou/coq,SkySkimmer/coq,ppedrot/coq,ejgallego/coq,herbelin/github-coq,mlasson/coq,ppedrot/coq,Zimmi48/coq,ppedrot/coq,Ptival/coq,herbelin/coq-hh,TOSPIO/coq,mlasson/coq,ale-f/coq,8l/coq,asr/coq,pirbo/coq,jhjourdan/coq,TOSPIO/coq,mattam82/Coq-misc,jhjourdan/coq,ale-f/coq,tomprince/coq,amintimany/coq,letouzey/coq-wip,TheTypoMaster/coq,gmalecha/coq,tomprince/coq,letouzey/coq-wip