Restructured some of the minor chapters at the end of the docs

Proposed structure (look for ###):

    1. NeXus: User Manual
        1.1. Preface
        1.2. NeXus Introduction
        1.3. NeXus Design
        1.4. Constructing NeXus Files and Application Definitions
        1.5. Strategies for storing information in NeXus data files
        1.6. Verification and validation of files
        1.7. Frequently Asked Questions ### moved up
    2. NeXus: Reference Documentation
        2.1. Introduction to NeXus definitions
        2.2. NXDL: The NeXus Definition Language
        2.3. Base Class Definitions
        2.4. Application Definitions
        2.5. Contributed Definitions
        2.6. Examples of writing and reading NeXus data files
    3. NAPI: NeXus Application Programmer Interface (frozen)
        3.1. Status
        3.2. Overview
        3.3. Core API
        3.4. Utility API
        3.5. Building Programs
        3.6. Reporting Bugs in the NeXus API
    4. NeXus Community
        4.1. NeXus Wiki
        4.2. Contributed Definitions
        4.3. Other Ways NeXus Coordinates with the Scientific Community
    5. Installation
        5.1. Precompiled Binary Installation
        5.2. Source Installation
    6. NeXus Utilities
        6.1. Utilities supplied with NeXus
        6.2. Data Analysis
        6.3. HDF Tools
    7. Brief history of NeXus
        7.1. The NeXus format ### subsection header inserted
        7.2. The description language NXDL
    8. About these docs ### several sections regrouped here
        8.1. Authors ### alphabetic order, except for the editor - okay?
        8.2. Colophon
        8.3. Revision History
        8.4. Copyright and Licenses