Clarified some of the text.
Made the use of quotes more consistent.
Wrote Chapter 5, "USING GET SERVICE".
Added an empty Chapter 10, "THE SERVICE REFERENCE".
* Added more comments to a few modules
* Changed the semantics of adding and removing user fields ("user data types")
* Implemented a factory service to perform those semantics ('registerField', 'removeField' and the convenience 'registerSetting')
* Added a missing return in the MySQL implementation of the user data source
* Added an assert in the MySQL version of 'addRight' to catch an easy error
* Added XXX comment in the MySQL version of 'addRight' (will fix this in the next patch)
* Fixed a case where sending an undefined value to the DBI database implementation would fail during the untainting
* Fixed MySQLID to actually work (in the DBI ResultsFrame)
* Fixed two typos in the user service ('settings' to 'setting')
* Added the requirement that a user must have certain rights to use the COSES editor
* Added a setupInstall implementation to the COSES editor
Added some comments to various user-related files.
Factored out some code that started becoming common when inserting fields in Service/User.pm.
Added code to deal with adding new contact details.
Added code to support removing fields from a user.
