1. Add the new amalloc module, which (if enabled with

--enable-amalloc) replaced malloc and its ilk with
    versions that attempt to maintain a linked list of
    allocated blocks that can be printed to stderr with
    the `adump()` function.

2.  Clean up a couple more places where I leak memory
    during the first level parse.

3.  tweak cstring.h to try to chase down places where
    the C compiler might optimize EXPAND() into producing
    broken code.

cstring.h

@@ -10,16 +10,17 @@
 #include <string.h>
 #include <stdlib.h>
 
+#include "amalloc.h"
+
 /* expandable Pascal-style string.
  */
 #define STRING(type)	struct { type *text; int size, alloc; }
 
 #define RESERVE(x,c)	(x).text = malloc(sizeof T(x)[0] * (((x).size=0),((x).alloc=(c))) )
 #define CREATE(x)	RESERVE(x,100)
-#define EXPAND(x)	(x).text[((x).size < (x).alloc \
-			    ? 0 \
-			    : !((x).text = realloc((x).text, sizeof T(x)[0] * ((x).alloc += 100)))), \
-			(x).size++]
+#define EXPAND(x)	((x).size++)[((x).size < (x).alloc) \
+			    ? (x).text \
+			    : (x).text = realloc((x).text, sizeof T(x)[0] * ((x).alloc += 100))]
 
 #define DELETE(x)	(x).alloc ? (free(T(x)), S(x) = (x).alloc = 0) \
 				  : ( S(x) = 0 )