organization in the src structure, modification of README

src/USEFUL/basic_examples/example_logging.py

@@ -0,0 +1,21 @@
+#!/usr/bin/env python
+
+__author__ = "bt3"
+
+import logging
+
+LOG_FILENAME = 'logging_example.out'
+logging.basicConfig(filename=LOG_FILENAME,
+                    level=logging.DEBUG,
+                    )
+
+logging.debug('This message should go to the log file')
+
+f = open(LOG_FILENAME, 'rt')
+try:
+    body = f.read()
+finally:
+    f.close()
+
+print 'FILE:'
+print body