+0.5.3 - ?/7/2008 - bugfix release
+ * many fixes concerning the CProp hiearchy
+ * coercion database simplified
+ * coercion hiding now works properly for coercions to funclass
+ * triangular pullback works better with coercions to the function space
+
+0.5.2 - 2/7/2008 - better-usability-for-the-working-constructivist release
+ * 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)
+ * Notation now allows to set the precedence level of subterms, avoiding
+ unnecessary parenthese
+ * UTF-8 / TeX conversion table is now available in the Help menu
+ * Notation subsystem described in the manual
+ * EBNF term grammar is now available in the View menu (and is in sync with
+ the currently loaded notation)
+ * Rewrite tactic (in hypothesis) now computes the right sort and
+ uses the right equality elimination principle
+ * URI free interpretation and coercion statements (scripts are almost
+ relocatable now)
+ * elim and cases tactic now support a pattern to specify hypotheses that
+ are generalized before the elimination.
+
+0.5.1 - 29/5/2008 - minor bug fix release