Graft pcb-tools upstream onto gerbonara tree

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+:mod:`excellon` --- Excellon file handling
+==============================================
+
+.. module:: excellon
+   :synopsis: Functions and classes for handling Excellon files
+.. sectionauthor:: Hamilton Kibbe <ham@hamiltonkib.be>
+
+
+The Excellon format is the most common format for exporting PCB drill
+information. The Excellon format is used to program CNC drilling macines for
+drilling holes in PCBs. As such, excellon files are sometimes refererred to as
+NC-drill files.  The Excellon format reference is available 
+`here <http://www.excellon.com/manuals/program.htm>`_. The :mod:`excellon`
+submodule implements calsses to read and write excellon files without having
+to know the precise details of the format.
+
+The :mod:`excellon` submodule's :func:`read` function serves as a
+simple interface for parsing excellon files.  The :class:`ExcellonFile` class
+stores all the information contained in an Excellon file allowing the file to
+be analyzed, modified, and updated. The :class:`ExcellonParser` class is used
+in the background for parsing RS-274X files.
+
+.. _excellon-contents:
+
+Functions
+---------
+The :mod:`excellon` module defines the following functions:
+
+.. autofunction:: gerber.excellon.read
+    
+
+Classes
+-------
+The :mod:`excellon` module defines the following classes:
+
+.. autoclass:: gerber.excellon.ExcellonFile
+    :members:
+    
+
+.. autoclass:: gerber.excellon.ExcellonParser
+    :members:
+    
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