New file. Root for the "Mailutils internals" manual.

+\input texinfo  @c -*-texinfo-*-
+@c %**start of header
+@setfilename muint.info
+@settitle GNU Mailutils, the architecture and development
+@setchapternewpage off
+@finalout
+@c %**end of header
+
+@c @include version.texi
+
+@ifinfo
+@dircategory GNU libraries
+@direntry
+* mailutils-int: (muint).  The internals of GNU Mailutils.
+@end direntry
+@end ifinfo
+
+@copying
+Published by the Free Software Foundation,
+59 Temple Place - Suite 330
+Boston, MA 02111-1307, USA
+
+Copyright @copyright{} 2003 Free Software Foundation, Inc.
+
+Permission is granted to copy, distribute and/or modify this document
+under the terms of the GNU Free Documentation License, Version 1.2 or
+any later version published by the Free Software Foundation; with no
+Invariant Sections, with the Front-Cover texts being ``A GNU Manual'',
+and with the Back-Cover Texts as in (a) below.  A copy of the license
+is included in the section entitled ``GNU Free Documentation License''.
+
+(a) The FSF's Back-Cover Text is: ``You have freedom to copy and modify
+this GNU Manual, like GNU software.  Copies published by the Free
+Software Foundation raise funds for GNU development.''
+@end copying
+
+@titlepage
+@title GNU Mailutils Internals
+@subtitle version @value{VERSION}, @value{UPDATED}
+@page
+@vskip 0pt plus 1filll
+@insertcopying
+@end titlepage
+
+@page
+@summarycontents
+@page
+
+@node Top, Introduction, (dir), (dir)
+@comment  node-name,  next,  previous,  up
+
+@chapter Scope of this Document
+
+This document describes the internals of the GNU Mailutils.  It
+includes description of Mailutils' architecture, algorithms and
+data structures. It is intended primarily for Mailutils developers
+and those who wish to participate in the development of the package.
+
+@menu
+* Introduction::            Introduction to the Mailutils Architecture.
+* Object Model::            The Mailutils Object Model.
+
+Indices
+* Concept Index::           Index of Concepts.
+
+@end menu
+
+@node Introduction, Object Model, Top, Top
+@comment  node-name,  next,  previous,  up
+@chapter Introduction to the Mailutils Architecture.
+@cindex Introduction
+
+Mailutils is written in plain C using object-oriented approach. Each
+part of the email message is represented as an object within the
+Mailutils hierarchical structure. Such an object contains all the
+information about the message part it represents and it provides
+all the methods necessary for dealing with its data. All Mailutils
+objects derive from the single root object. The object system is
+discussed in further detail in chapter @ref{Object Model}.
+
+@node Object Model, Concept Index, Introduction, Top
+@comment  node-name,  next,  previous,  up
+@include mom.texi
+
+@node Concept Index, , Object Model, Top
+@comment node-name,  next,  previous,  up
+@unnumbered Concept Index
+
+This is a general index of all issues discussed in this manual
+
+@printindex cp
+@page
+
+@contents
+
+@bye