Add documentation of counting rules

docs/source/more_projectformat.rst

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+.. _a_prjfmt:
+
+**********************
+Project Format Changes
+**********************
+
+.. _File Format Spec 1.5: _static/fileformatspec15.pdf
+.. _documentation: https://docs.novelwriter.io/
+
+Most of the changes to the file formats over the history of novelWriter have no impact on the
+user side of things. The project files are generally updated automatically. However, some of the
+changes require minor actions from the user.
+
+The key changes in the formats are listed in this chapter, as well as the user actions required,
+where applicable.
+
+.. only:: not html
+
+   A full project file format specification is available in the online documentation_.
+
+.. caution::
+   When you update a project from one format version to the next, the project can no longer be
+   opened by a version of novelWriter prior to the version where the new file format was
+   introduced. You will get a notification about any updates to your project file format and will
+   have the option to decline the upgrade.
+
+.. only:: html
+
+   **For Developers**
+
+   A full description of the current file format is available in the
+   :download:`File Format Spec 1.5 <fileformatspec15.pdf>`
+   document, available as a PDF. This document is intended for contributors to novelWriter, those
+   building project conversion tools, either to or from tne novelWriter format, and for those who
+   wish to make their own templating system.
+
+
+.. _a_prjfmt_1_5:
+
+Format 1.5 Changes
+==================
+
+This project format was introduced in novelWriter version 2.0 RC 2.
+
+This is a modification of the 1.4 format. It makes the XML more consistent in that meta data have
+been moved to their respective section nodes as attributes, and key/value settings now have a
+consistent format. Logical flags are saved as yes/no instead of Python True/False, and the main
+heading of the document is now saved to the item rather than in the index. The conversion is done
+automatically the first time a project is loaded. No user action is required.
+
+
+.. _a_prjfmt_1_4:
+
+Format 1.4 Changes
+==================
+
+This project format was introduced in novelWriter version 2.0 RC 1. Since this was a release
+candidate, it is unlikely that your project uses it, but it may be the case if you've installed a
+pre-release.
+
+This format changes the way project items (folders, documents and notes) are stored. It is a more
+compact format that is simpler and faster to parse, and easier to extend. The conversion is done
+automatically the first time a project is loaded. No user action is required.
+
+
+.. _a_prjfmt_1_3:
+
+Format 1.3 Changes
+==================
+
+This project format was introduced in novelWriter version 1.5.
+
+With this format, the number of document layouts was reduced from eight to two. The conversion of
+document layouts is performed automatically when the project is opened.
+
+Due to the reduction of layouts, some features that were previously controlled by these layouts
+will be lost. These features are instead now controlled by syntax codes, so to recover these
+features, some minor modification must be made to select documents by the user.
+
+The manual changes the user must make should be very few as they apply to document layouts that
+should be used only a few places in any given project. These are as follows:
+
+**Title Pages**
+
+* The formatting of the level one title on the title page must be changed from ``# Title Text`` to
+  ``#! Title Text`` in order to retain the previous functionality. See :ref:`a_fmt_head`.
+* Any text that was previously centred on the page must be manually centred using the text
+  alignment feature. See :ref:`a_fmt_align`.
+
+**Unnumbered Chapters**
+
+* Since the specific layout for unnumbered chapters has been dropped, such chapters must all use
+  the ``##! Chapter Name`` formatting code instead of ``## Chapter Name``. This also includes
+  chapters marked by an asterisk: ``## *Chapter Name``, as this feature has also been dropped.
+  See :ref:`a_fmt_head`.
+
+**Plain Pages**
+
+* The layout named "Plain Page" has also been removed. The only feature of this layout was that it
+  ensured that the content always started on a fresh page. In the new format, fresh pages can be
+  set anywhere in the text with the ``[NEW PAGE]`` code. See :ref:`a_fmt_break`.
+
+
+.. _a_prjfmt_1_2:
+
+Format 1.2 Changes
+==================
+
+This project format was introduced in novelWriter version 0.10.
+
+With this format, the way auto-replace entries were stored in the main project XML file changed.
+
+
+.. _a_prjfmt_1_1:
+
+Format 1.1 Changes
+==================
+
+This project format was introduced in novelWriter version 0.7.
+
+With this format, the ``content`` folder was introduced in the project storage. Previously, all
+novelWriter documents were saved in a series of folders numbered from ``data_0`` to ``data_f``.
+
+It also reduces the number of meta data and cache files. These files are automatically deleted if
+an old project is opened. This was also when the Table of Contents file was introduced.
+
+
+.. _a_prjfmt_1_0:
+
+Format 1.0 Changes
+==================
+
+This is the original file format and project structure. It was in use up to version 0.6.3.