CHANGES: my recent updates to Ltac.
CHANGES: my recent updates to Ltac.

- gfail
- multimatch
- tryif/then/else
aspiwack/coq,william-lawvere/coq,william-lawvere/coq,william-lawvere/coq,ppedrot/coq,JasonGross/coq,maximedenes/coq,asr/coq,ppedrot/coq,8l/coq,gares/coq,letouzey/coq-wip,mattam82/coq,Zimmi48/coq,ejgallego/coq,coq/coq,letouzey/coq-wip,ppedrot/coq,TOSPIO/coq,TheTypoMaster/coq,herbelin/github-coq,Lionel-Rieg/coq,Ptival/coq,SkySkimmer/coq,Matafou/coq,mlasson/coq,TOSPIO/coq,Ptival/coq,ppedrot/coq,mattam82/coq,gares/coq,silene/coq,maximedenes/coq,gares/coq,8l/coq,coq/coq,jpdeplaix/coq,asr/coq,ejgallego/coq,coq/coq,aspiwack/coq,SkySkimmer/coq,coq/coq,ale-f/coq,Lionel-Rieg/coq,jpdeplaix/coq,letouzey/coq-wip,Zimmi48/coq,jpdeplaix/coq,JasonGross/coq,amintimany/coq,mlasson/coq,silene/coq,Lionel-Rieg/coq,SkySkimmer/coq,barras/coq,ale-f/coq,maximedenes/coq,barras/coq,ppedrot/coq,gmalecha/coq,amintimany/coq,gares/coq,TOSPIO/coq,barras/coq,aspiwack/coq,herbelin/github-coq,Matafou/coq,maximedenes/coq,letouzey/coq-wip,amintimany/coq,Ptival/coq,TheTypoMaster/coq,gmalecha/coq,ejgallego/coq,Matafou/coq,Zimmi48/coq,mattam82/coq,letouzey/coq-wip,mlasson/coq,SkySkimmer/coq,TheTypoMaster/coq,8l/coq,maximedenes/coq,Zimmi48/coq,JasonGross/coq,silene/coq,gares/coq,herbelin/github-coq,gmalecha/coq,asr/coq,ejgallego/coq,JasonGross/coq,ale-f/coq