CLN: What is the purpose of datetools.py?
The doc-string at the top of <a href="https://github.com/pydata/pandas/blob/0e61847e111a3ba181f16c8b9b974c74d360ad2e/pandas/core/datetools.py">datetools.py</a> seems to indicate this is just a hodge-podge of datetime-related objects.  Seems like that could be cleaned up unless there is good reason to have it.
