CodeSnip Old Code (SVN)

* Added new UTestHelpers unit to unit tests project to provide commonly used code for use by test cases. Only content is TAlwaysFreeController class. (Neglected to add UTestHelpers to SVN repo - see r980 for rectification).
* Modified various test case units that provided their own implementations of TAlwaysFreeController to use version in UTestHelpers unit.

* Added new DB.USnippet unit that provides a skeleton implementation of a snippet along with supporting types.
* Added new DB.UConsts unit to provide basic type and constant definitions required by database code.
* Added test suite for DB.USnippet unit.