update for 1.3

CHANGES

 This file is a brief description of changes in this new release of ARC.
 Details can be found in the ChangeLog file.
 
+arc 1.3:
+ New features:
+    . add ARC handbook.
+    . add experimental 'sequences' command that should produces sequences
+      leading an AltaRica node into unexpected states.
+    . in Acheck specs, more commands are available with DDs: trace, dot, quot, 
+      project
+    . explicit representation now encodes values with 'int'.    
+    . add timers for Mec 5 computations. Timers are enabled using "mec5.timers" 
+      setting.
+    . in the simulator, add a button that generates the current assignment of 
+      state variables as an "init" clause.
+    . show(all) now order properties lexicographically.
+    . add the 'validate' command that checks some small properties of nodes 
+      (e.g. domains coverage, macro-transitions usage, ...)
+    . add an 'obfuscation' command permitting to obfuscate models and specs.
+    . display a warning message when two enums with no intersection are 
+      compared.
+    . in Acheck specs, TEST(X) behaves like check-card i.e. checks the 
+      non-emptiness of X
+    . support additional constraint for the initial configuration.
+
+ Bug fixing:
+    . DD engine did not handle correctly the case where an assertion was simply 
+      "true".
+    . check that values assigned to "const" symbols are in the given domain.
+    . DD engine handled incorrectly domains of variables declared equal by 
+      assertions. When domains differed (e.g. two different ranges) one 
+      variable could be assigned the domain of the other.
+    . cell collector of the backtracking stack of the solver was not used.
+    . Flow variables could be assigned by transitions
+    . show-ts-marks treated only its first argument.
+    . double deallocation in 'pick' command yielding a segfault.
+    . bug fixed in fixpoint computation for unavoidable configurations ('unav')
+      in explicti representation.
+    . visibility was not checked in guards.
+
 arc 1.2:
  New features:
     . add an interpreter for Mec5 specifications 

NEWS

 ARC NEWS - History of user visible changes.
-Copyright (C) 2007-2009 Alain Griffault, Gerald Point, Aymeric Vincent
+
+What's new in 1.3:
+* add ARC handbook.
+* add experimental 'sequences' command that should produces sequences leading 
+  an AltaRica node into unexpected states.
+* in Acheck specs, more commands are available with DDs: trace, dot, quot, 
+  project.
+* explicit representation now encodes values with 'int'.    
+* add timers for Mec 5 computations. Timers are enabled using "mec5.timers" 
+  setting.
+* in the simulator, add a button that generates the current assignment of 
+  state variables as an "init" clause.
+* show(all) now order properties lexicographically.
+* add the 'validate' command that checks some small properties of nodes 
+  (e.g. domains coverage, macro-transitions usage, ...)
+* add an 'obfuscation' command permitting to obfuscate models and specs.
+* display a warning message when two enums with no intersection are compared.
+* in Acheck specs, TEST(X) behaves like check-card i.e. checks the 
+  non-emptiness of X
+* support additional constraint for the initial configuration.
 
 What's new in 1.2:
 * Add pkg-config support.