1 Fix bug with very short word: prefix and suffix might be overlapped,

  sorry but fix can't be applyed to previous version: it's require
  refill tsvector...
2 Small optimize of load time for huge dictionaries
3 use palloc instead of malloc during load dict file

contrib/tsearch2/ispell/spell.h

@@ -32,7 +32,6 @@ typedef struct SPNode
 
 typedef struct spell_struct
 {
-	char	   *word;
 	union
 	{
 		char		flag[16];
@@ -41,9 +40,12 @@ typedef struct spell_struct
 			int			affix;
 			int			len;
 		}			d;
-	}			p;
+	}	p;
+	char	word[1];
 }	SPELL;
 
+#define SPELLHDRSZ	(offsetof(SPELL, word))
+
 typedef struct aff_struct
 {
 	uint32
@@ -106,7 +108,7 @@ typedef struct
 
 	int			nspell;
 	int			mspell;
-	SPELL	   *Spell;
+	SPELL	   **Spell;
 
 	AffixNode  *Suffix;
 	AffixNode  *Prefix;