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.UCategoryGroup unit that provides a skeleton implementation of a category group in the database along with supporting types.
* Added test suite for DB.UCategoryGroup unit.

Added new DB.UBaseGroup unit containing abstract base class of all database classes the encapsulate a "group".

* 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.

Removed unused field, method and constructor parameter from TestTObjectDestructionMgr.TTestDataItem.

* Added optional Lock parameter to TObjectDestructionMgr.HookController method and added test to test case unit to check case when Lock is True.
* Changed anonymous function in TObjectDestructionMgr.Create to raise EBug if unknown permission kind detected.

* Added new Lock method, Locked property and new write accessor for FreeController property of TControlledConditionalFreeObject. Attempting to write a non-nil FreeController property when locked now raises new ELocked exception.
* Added ELocked exception to UBaseObjects unit.
* Added new unit test for Lock method and Locked property of TControlledConditionalFreeObject.

* Modified existing tests to compile and pass now that Controller property removed from TObjectDestructionMgr.
* Added new tests for new TObjectDestructionMgr.HookController method and for TObjectDestructionMgr constructor.

There was a duplicate name problem with the new "Database" namespace so this was altered to "DB". All units in the namespace were renamed accordingly. All related test units were again renamed in line with their related "DB" units. Unit references etc were also adjusted.

* Renamed NsDatabase.UDataPool.pas as Database.UDataPool.pas.
* Renamed TestNsDatabaseUDataPool.pas as TestDatabaseUDataPool.pas and modified it to refer to renamed Database.UDataPool unit.