Fix a bug in externalisation which prevented printing of projections using dot notation.
Fix a bug in externalisation which prevented printing of projections
using dot notation.

maximedenes/coq,amintimany/coq,letouzey/coq-wip,ejgallego/coq,Lionel-Rieg/coq,maximedenes/coq,herbelin/github-coq,letouzey/coq-wip,Matafou/coq,ppedrot/coq,Matafou/coq,ejgallego/coq,Ptival/coq,Lionel-Rieg/coq,Ptival/coq,ppedrot/coq,silene/coq,letouzey/coq-wip,ppedrot/coq,maximedenes/coq,herbelin/github-coq,mattam82/coq,william-lawvere/coq,gares/coq,gares/coq,amintimany/coq,gares/coq,Zimmi48/coq,ejgallego/coq,gares/coq,Ptival/coq,SkySkimmer/coq,letouzey/coq-wip,SkySkimmer/coq,JasonGross/coq,ppedrot/coq,ppedrot/coq,herbelin/github-coq,SkySkimmer/coq,amintimany/coq,Zimmi48/coq,letouzey/coq-wip,JasonGross/coq,mattam82/coq,coq/coq,william-lawvere/coq,silene/coq,maximedenes/coq,JasonGross/coq,SkySkimmer/coq,gares/coq,coq/coq,Lionel-Rieg/coq,coq/coq,ejgallego/coq,Zimmi48/coq,william-lawvere/coq,mattam82/coq,Zimmi48/coq,maximedenes/coq,Matafou/coq,JasonGross/coq,silene/coq,coq/coq