save: remove

Get rid of the output in Spot's format.

This finally fixes #1.

* src/tgbaalgos/save.cc, src/tgbaalgos/save.hh: Delete.
* src/tgbaalgos/Makefile.am: Adjust.
* src/ltlvisit/contain.cc: Remove useless includes.
* src/bin/dstar2tgba.cc, src/bin/common_aoutput.cc,
src/bin/common_aoutput.hh: Remove the "Spot" output.
* doc/org/dstar2tgba.org, doc/org/ioltl.org,
doc/org/ltl2tgba.org, doc/org/oaut.org: Update doc.
* NEWS: Mention that Spot i/o is gone.
* src/tgbatest/randtgba.cc: Output in HOA.
* src/tgbatest/randtgba.test: Use randaut instead of
randtgba.
* wrap/python/spot.i: Do not provide binding for save.hh

NEWS

@@ -218,6 +218,11 @@ New in spot 1.99a (not yet released)
     - The unused implementation of state-based alternating Büchi automata
       has been removed.
 
+    - Input and output in the old, Spot-specific, text format for
+      TGBA, has been fully removed.  We now use HOA everywhere.  (In
+      case you have a file in this format, install Spot 1.2.6 and use
+      "src/tgbatest/ltl2tgba -H -X file" to convert the file to HOA.)
+
 New in spot 1.2.6a (not yet released)
 
   Nothing yet.