Use absolute path, easier to understand in --help output.

apachedex/__init__.py

@@ -377,7 +377,7 @@ period_parser = {
 }
 
 def main():
-  file_dir = os.path.dirname(__file__)
+  file_dir = os.path.abspath(os.path.dirname(__file__))
   parser = argparse.ArgumentParser(description='Compute Apdex out of log files')
   parser.add_argument('logfile', nargs='+',
     help='Log files to process')