Releasing opam package for version 2.66.1

_oasis

 OASISFormat: 0.4
 Name:        lutin
-Version:     2.66.0-3-g1a81cf1b
+Version:     2.66.1
 Authors:     Erwan Jahier, Pascal Raymond, Bertrand Jeannnet (polka), Yvan Roux
 Maintainers: erwan.jahier@univ-grenoble-alpes.fr  
 License:     CeCILL

lutin/src/version.ml

-let str="1.0.0"
-let sha="1a81cf1b"
+let str="2.66.1"
+let sha="a821a52a"