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Updated help topic re changed made to Updates tab of Preferences dialogue box at revision 2898.

Heavily revised unit.
Introduced a common abstract base class for TProgramUpdateCheckerThread and TDatabaseUpdateCheckerThread that provides common functionality. This new class also takes on the work of the TUpdateCheckerConfig class, which was removed.
Revised to support user-specified update frequencies. (Previously only check is user had given or denied permission to perform updates and used a 1 day frequency.

Replaced check boxes that were used to switch on and off auto-update checking with combo boxes where user can choose a suitable auto-update checking frequency.

Replaced IPreferences AutoCheckDatabaseUpdates and AutoCheckProgramUpdates properties with AutoCheckDatabaseFrequency and AutoCheckProgramFrequency respectively. These properties now specify a frequency of update checking in days, with 0 being "don't check".

Completed XMLDoc commenting unit.

Renamed ISettingsSection's GetEncryptedItemValue and SetEncryptedItemValue methods as GetEncryptedString and SetEncryptedString respectively.
Modified affected client code to use new method names.

Added code to start and stop code that checks for program and database updates in background threads along with code that displays any resulting notifications in a pop up window in main window.

Modified re changes made in USettings unit in previous revision.

Added new methods to read and write settings values by type to ISettingsSection and implementation. Supported types are - Boolean, Integer, Float, Date-Time and String. The idea is that the burden of value type conversion is moved from client code into Settings object. Boolean values are now written as 'True' and 'False'.
Removed old ItemValues[] array property - now replaced by new methods above.
Removed several unused methods and properties from ISettingsSection and its implementation.

Noted data types used in ini files.