* NEWS: Summarize recent changes.

NEWS

@@ -1,6 +1,39 @@
 New in spot 0.6a:
 
-  Nothing yet.
+  * Spot is now able to read an automaton expressed as a Spin neverclaim.
+  * The "experimental" Kripke structure introduced in Spot 0.5 has
+    been rewritten, and is no longer experimental.  We have a
+    developement version of checkpn using it, and it should be
+    released shortly after Spot 0.7.
+  * The function to_spin_string(), used to output an LTL formula using
+    Spin's syntax, now takes an optional argument to request full 
+    parenthesis.
+  * src/ltltest/genltl is a new tool that generates some interesting
+    families of LTL formulae, for testing purpose.
+  * bench/ltlclasses/ uses the above tool to conduct the same benchmark 
+    as in the DepCoS'09 paper by Cichón et al.  The resulting benchmark
+    completes in 12min, while it tooks days (or crashed) when the paper 
+    was written (using Spot 0.4).
+  * Degeneralization has again been improved in two ways:
+    - It will merge the degeneralized transitions that can be merged.
+    - It uses a cache to speed up the improvement introduced in 0.6.
+  * New ltl2tgba options:
+    -XN: read an input automaton as a neverclaim.
+    -C, -CR: Compute (and display) a counterexample after running the
+             emptiness check.  With -CR, the counterexample will be
+             replayed on the automaton to ensure it is correct 
+	     (previous version would always compute a replay a 
+	     counterexample when emptiness-check was enabled)
+    -ks: traverse the automaton to compute its number of states and
+         transitions (this is faster than -k whichi will also count
+         SCCs and paths).
+  * Bug fixes:
+    - Location of the errors messages in the TGBA parser where inaccurate.
+    - Various warning fixes for different versions of GCC and Clang.
+    - The neverclaim output with ltl2tgba -N or -NN used to ignore any
+      automaton simplification performed after degeneralization.
+    - The formula simplification based on universality and eventuallity 
+      had a quadratic run-time.    
 
 New in spot 0.6 (16-04-2010):