%define push_pull -> %define api.push_pull. Discussed starting at

<http://lists.gnu.org/archive/html/bison-patches/2007-09/msg00005.html>.
* data/push.c: Expect the new name.
* data/yacc.c: Likewise.
* doc/bison.texinfo (Push Decl): Update.
(Decl Summary): Update %define entry.
(Push Parser Function): Update.
(Pull Parser Function): Update.
(Parser Create Function): Update.
(Parser Delete Function): Update.
* tests/calc.at (Simple LALR Calculator): Update.
* tests/input.at (%define enum variables): Update.
* tests/push.at (Push Parsing: Memory Leak for Early Deletion): Update.
(Push Parsing: Multiple impure instances): Update.
(Push Parsing: Unsupported Skeletons): Update.
* tests/torture.at (Exploding the Stack Size with Alloca): Update.
(Exploding the Stack Size with Malloc): Update.

* NEWS (2.3a+): Add an entry for the push parser, and clean up the
other entries some.

tests/push.at

@@ -33,7 +33,7 @@ AT_DATA_GRAMMAR([[input.y]],
   void yyerror (char const *msg);
 %}
 
-%pure-parser %define push_pull "push"
+%pure-parser %define api.push_pull "push"
 
 %%
 
@@ -92,7 +92,7 @@ AT_DATA_GRAMMAR([[input.y]],
   int yylex (void);
 %}
 
-%define push_pull "both"
+%define api.push_pull "both"
 
 %%
 
@@ -158,13 +158,13 @@ AT_SETUP([[Push Parsing: Unsupported Skeletons]])
 
 AT_DATA([[input.y]],
 [[%glr-parser
-%define push_pull "push"
+%define api.push_pull "push"
 %%
 start: ;
 ]])
 
 AT_CHECK([[bison input.y]], [0], [],
-[[input.y:2.9-17: warning: %define variable `push_pull' is not used
+[[input.y:2.9-21: warning: %define variable `api.push_pull' is not used
 ]])
 
 AT_CLEANUP