Sorting/Permutation: no need to require the whole Arith (and hence plugins like ring)
Sorting/Permutation: no need to require the whole Arith (and hence plugins like ring)

git-svn-id: 44dc50bdcc0f5d1a212c497508dc9452e0b35e2b@12454 85f007b7-540e-0410-9357-904b9bb8a0f7

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