UF theory bug fixes, code cleanup, and extra debugging output.

Enabled new UF theory by default.

Added some UF regressions.

Some work on the whole equality-over-bool-removed-in-favor-of-IFF
thing.  (Congruence closure module and other things have to handle
IFF as a special case of equality, etc..)

Added pre-rewriting to TheoryBool which rewrites:

  * (IFF true x)          =>  x
  * (IFF false x)         =>  (NOT x)
  * (IFF x true)          =>  x
  * (IFF x false)         =>  (NOT x)
  * (IFF x x)             =>  true
  * (IFF x (NOT x))       =>  false
  * (IFF (NOT x) x)       =>  false

  * (ITE true x y)        =>  x
  * (ITE false x y)       =>  y
  * (ITE cond x x)        =>  x

Added post-rewriting that does all of the above, plus normalize IFF and ITE:

  * (IFF x y)             =>  (IFF y x), if y < x
  * (ITE (NOT cond) x y)  =>  (ITE cond y x)

(Note: ITEs survive the removal-of-ITEs pass only if they are Boolean-valued.)

A little more debugging output from CNF stream, context pushes/pops,
ITE removal.

Some more documentation.

Fixed some typos.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/main/getopt.cpp b/src/main/getopt.cpp
index b15f4ae66..08bcbaa7c 100644
--- a/src/main/getopt.cpp
+++ b/src/main/getopt.cpp
@@ -262,7 +262,7 @@ throw(OptionException) {
           printf("morgan\n");
           exit(1);
         } else {
-          throw OptionException(string("unknown language for --uf: `") +
+          throw OptionException(string("unknown option for --uf: `") +
                                 optarg + "'.  Try --uf help.");
         }
       }