[configure] Reworking of directory configuration
[configure] Reworking of directory configuration

Still more work to do.

coq/coq,ejgallego/coq,SkySkimmer/coq,SkySkimmer/coq,ejgallego/coq,Zimmi48/coq,SkySkimmer/coq,coq/coq,Zimmi48/coq,coq/coq,coq/coq,Zimmi48/coq,ejgallego/coq,ejgallego/coq,SkySkimmer/coq,Zimmi48/coq