Split the development into different directories

FiniteSets/_CoqProject

@@ -2,16 +2,17 @@
 -R ../prelude ""
 lattice.v
 disjunction.v
-bad.v
-definition.v
-operations.v
-properties.v
-operations_decidable.v
-extensionality.v
-properties_decidable.v
-monad.v
-cons_repr.v
-lists.v
-enumerated.v
+representations/bad.v
+representations/definition.v
+fsets/operations.v
+fsets/properties.v
+fsets/operations_decidable.v
+fsets/extensionality.v
+fsets/properties_decidable.v
+fsets/monad.v
+FSets.v
+representations/cons_repr.v
+implementations/lists.v
+variations/enumerated.v
 #empty_set.v
 #ordered.v