Add vim/emacs modelines to all source files

Fixes #fdo30794
Based on bin/add-modelines script (originally posted in mail
1286706307.1871.1399280959@webmail.messagingengine.com)

Signed-off-by: Sebastian Spaeth <Sebastian@SSpaeth.de>

basic/source/comp/exprnode.cxx

@@ -1,3 +1,4 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
 /*************************************************************************
  *
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
@@ -486,3 +487,4 @@ void SbiExprNode::FoldConstants()
 }
 
 
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */