Bugfixes in standalone code for Calibre < 5 / Python 2

DeDRM_plugin/erdr2pml.py

@@ -71,9 +71,7 @@ __version__='1.00'
 import sys, re
 import struct, binascii, getopt, zlib, os, os.path, urllib, tempfile, traceback
 
-# Calibre stuff - so we can import from our ZIP without absolute module name
-sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
-
+#@@CALIBRE_COMPAT_CODE@@
 
 # Wrap a stream so that output gets flushed immediately
 # and also make sure that any unicode strings get