add hg and python

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+\section{\module{grp} ---
+         The group database}
+
+\declaremodule{builtin}{grp}
+  \platform{Unix}
+\modulesynopsis{The group database (\function{getgrnam()} and friends).}
+
+
+This module provides access to the \UNIX{} group database.
+It is available on all \UNIX{} versions.
+
+Group database entries are reported as a tuple-like object, whose
+attributes correspond to the members of the \code{group} structure
+(Attribute field below, see \code{<pwd.h>}):
+
+\begin{tableiii}{r|l|l}{textrm}{Index}{Attribute}{Meaning}
+  \lineiii{0}{gr_name}{the name of the group}
+  \lineiii{1}{gr_passwd}{the (encrypted) group password; often empty}
+  \lineiii{2}{gr_gid}{the numerical group ID}
+  \lineiii{3}{gr_mem}{all the group member's  user  names}
+\end{tableiii}
+
+The gid is an integer, name and password are strings, and the member
+list is a list of strings.
+(Note that most users are not explicitly listed as members of the
+group they are in according to the password database.  Check both
+databases to get complete membership information.)
+
+It defines the following items:
+
+\begin{funcdesc}{getgrgid}{gid}
+Return the group database entry for the given numeric group ID.
+\exception{KeyError} is raised if the entry asked for cannot be found.
+\end{funcdesc}
+
+\begin{funcdesc}{getgrnam}{name}
+Return the group database entry for the given group name.
+\exception{KeyError} is raised if the entry asked for cannot be found.
+\end{funcdesc}
+
+\begin{funcdesc}{getgrall}{}
+Return a list of all available group entries, in arbitrary order.
+\end{funcdesc}
+
+
+\begin{seealso}
+  \seemodule{pwd}{An interface to the user database, similar to this.}
+  \seemodule{spwd}{An interface to the shadow password database, similar to this.}
+\end{seealso}