+0.5.? - ?/?/? - ?
+ * refinement of match fixed to prevent useless unfolding,
+ head_beta_reduce is used instead of whd ~delta:true
+ * CProp hierarchy, interleaved with type (used to be a single universe)
+
+0.5.1 - 29/5/2008 - minor bug fix release
+ * visualization of inductive types reports the number of fixed parameters