CodeSnip Old Code (SVN)

Renamed various properties, fields, method names and parameter concerning category ids.

* Renamed again all DB.* units that are concerned with physically reading and writing database info to and from the file system as DBIO.*.
* Affected units updated.

* Renamed UIniDataReader, UNulDataReader and UXMLDataIO units as DB.UIniDataReader, DB.UNulDataReader and DB.UXMLDataIO respectively.
* Updated using unit.

* Renamed USnipData unit as DB.UFileIOIntf and USnippetsIO as DB.UDatabaseIO.
* Updated affected units.