Ensures a large enough search buffer for all modules.
Patch from mwtalbert.

Index: main/src/modules/swmodule.cpp
===================================================================
--- main.orig/src/modules/swmodule.cpp	2009-08-29 22:44:21.000000000 -0700
+++ main/src/modules/swmodule.cpp	2009-08-29 23:13:23.000000000 -0700
@@ -496,7 +496,7 @@
 #ifdef USELUCENE
 	if (searchType == -4) {	// lucene
 		//Buffers for the wchar<->utf8 char* conversion
-		const unsigned short int MAX_CONV_SIZE = 2047;
+	  const unsigned int MAX_CONV_SIZE = 1024 * 1024;
 		wchar_t wcharBuffer[MAX_CONV_SIZE + 1];
 		char utfBuffer[MAX_CONV_SIZE + 1];
 		
@@ -980,6 +980,7 @@
 	SWKey *searchKey = 0;
 	SWKey textkey;
 	SWBuf c;
+	const unsigned int MAX_CONV_SIZE = 1024 * 1024;
 
 
 	// turn all filters to default values
@@ -1027,6 +1028,7 @@
 
 	ramDir = new RAMDirectory();
 	coreWriter = new IndexWriter(ramDir, an, true);
+	coreWriter->setMaxFieldLength(MAX_CONV_SIZE);
 
 
 
@@ -1056,7 +1058,6 @@
 	SWBuf proxLem;
 	SWBuf strong;
 
-	const short int MAX_CONV_SIZE = 2047;
 	wchar_t wcharBuffer[MAX_CONV_SIZE + 1];
 
 	char err = Error();