allow vacation :days parameter to be '0', to respond to every single message

--- dovecot-1.2-sieve-0.1.13.orig/src/lib-sieve/plugins/vacation/cmd-vacation.c	2009-08-06 12:43:30.000000000 -0700
+++ dovecot-1.2-sieve-0.1.13/src/lib-sieve/plugins/vacation/cmd-vacation.c	2009-12-01 22:33:50.565468045 -0800
@@ -247,10 +247,12 @@ static bool cmd_vacation_validate_number
 		return FALSE;
 	}
 
+#if 0
 	/* Enforce :days > 0 */
 	if ( sieve_ast_argument_number(*arg) == 0 ) {
 		sieve_ast_argument_number_set(*arg, 1);
 	}
+#endif
 
 	/* Skip parameter */
 	*arg = sieve_ast_argument_next(*arg);
@@ -585,9 +587,11 @@ static int ext_vacation_operation_execut
 					return SIEVE_EXEC_BIN_CORRUPT;
 				}
 	
+#if 0
 				/* Enforce days > 0 (just to be sure) */
 				if ( days == 0 )
 					days = 1;
+#endif
 				break;
 			case OPT_SUBJECT:
 				if ( !sieve_opr_string_read(renv, address, &subject) ) {
@@ -996,7 +1000,7 @@ static bool act_vacation_commit
 	}
 	
 	/* Did whe respond to this user before? */
-	if ( senv->duplicate_check != NULL ) {
+	if ( ctx->days && senv->duplicate_check != NULL ) {
 		act_vacation_hash(ctx, sender, dupl_hash);
 	
 		if ( senv->duplicate_check(dupl_hash, sizeof(dupl_hash), senv->username) )