Sales (2 points)
================

A company that sells supplies to steel companies has the following data:

 * a *sales dictionary* (:class:`dict`) in which the key is the name
   of a client (:class:`str`) and the value is a :class:`list` of
   tuples (:class:`tuple`). Each tuple corresponds to a sale and has
   three items: the month (:class:`int`) and the day (:class:`int`)
   in which the sale was made, and the sales amount in euros
   (:class:`float`).
  
 * a *month sales file* with the sales made in a specific month. Each
   line of this file corresponds to a sale offer and has 3 or 4 data
   fields separated by a colon (``':'``): the day (:class:`int`), the
   client name (:class:`str`), and a Boolean (:class:`bool`) showing
   whether this offer ended up in a sale (``True``) or not
   (``False``). If the Boolean is ``True``, this line has a 4th data
   field which is the sold sale amount (:class:`float`).

Write a **modifier** function :py:func:`sales` that takes a sales
dictionary and the name of a month sales file (:class:`str`) as those
described, and a 3rd parameter which is the month number
(:class:`int`) that corresponds to the month sales file. This function
**modifies** the given dictionary taking into account the contents of
the given file, that is, adding to it the sales included in this file.
Beware: you must only add to the dictionary those sale offers in the file
that ended up in a sale. Once the dictionary has been updated, the
lists of each item must be sorted chronologically, i.e., first by
month and then by day.

Save this function in file ``sales.py``.

Example:

For a data file with the name :download:`steel1.txt` with the
following content:

.. literalinclude:: solution/steel1.txt
   :language: text
	   
this function must pass the following tests:

.. literalinclude:: test-sales.txt
   :language: python
   :lines: 9-18

.. note::

   Tests for automatic debugging are provided in file :download:`test-sales.txt`.