* C/preface.sgml: Minor fixes.
* C/usage-notes.sgml: New File for feature that is yet to come.
* C/evolution-guide.sgml: Added entity for notes chapter.
* C/usage-mainwindow.sgml: Un-commented references to notes section.
* C/apx-authors.sgml: Removed dcm from author list.
* C/usage-calendar.sgml: Added to-do list features.
svn path=/trunk/; revision=3818
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