add hg and python

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diff --git a/sys/src/cmd/python/Doc/lib/libcopyreg.tex b/sys/src/cmd/python/Doc/lib/libcopyreg.tex
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+\section{\module{copy_reg} ---
+         Register \module{pickle} support functions}
+
+\declaremodule[copyreg]{standard}{copy_reg}
+\modulesynopsis{Register \module{pickle} support functions.}
+
+
+The \module{copy_reg} module provides support for the
+\refmodule{pickle}\refstmodindex{pickle}\ and
+\refmodule{cPickle}\refbimodindex{cPickle}\ modules.  The
+\refmodule{copy}\refstmodindex{copy}\ module is likely to use this in the
+future as well.  It provides configuration information about object
+constructors which are not classes.  Such constructors may be factory
+functions or class instances.
+
+
+\begin{funcdesc}{constructor}{object}
+  Declares \var{object} to be a valid constructor.  If \var{object} is
+  not callable (and hence not valid as a constructor), raises
+  \exception{TypeError}.
+\end{funcdesc}
+
+\begin{funcdesc}{pickle}{type, function\optional{, constructor}}
+  Declares that \var{function} should be used as a ``reduction''
+  function for objects of type \var{type}; \var{type} must not be a
+  ``classic'' class object.  (Classic classes are handled differently;
+  see the documentation for the \refmodule{pickle} module for
+  details.)  \var{function} should return either a string or a tuple
+  containing two or three elements.
+
+  The optional \var{constructor} parameter, if provided, is a
+  callable object which can be used to reconstruct the object when
+  called with the tuple of arguments returned by \var{function} at
+  pickling time.  \exception{TypeError} will be raised if
+  \var{object} is a class or \var{constructor} is not callable.
+
+  See the \refmodule{pickle} module for more
+  details on the interface expected of \var{function} and
+  \var{constructor}.
+\end{funcdesc}