Housekeeping and cleanup.

  * Made the .gitignore file more generic.  All compiled Python output
    (.pyc and .pyo) should be ignored.
  * Fixed an extremely minor and ignorable typo in the 0.Readme.txt
    file.
Replaced unseen docstrings with comments.

Python generally interprets the double-underscore prefix of method names
such that the docstrings associated with those methods are not displayed
(there are exceptions).  In addition, the whole point of
double-underscoring a name is to keep the method private.

So...  I went through and replaced private-method docstrings with
comments that contain the same content.