* Converted ripcd(8) to use RDApplication.
* Documented a 'Notification' message type in
'docs/apis/notification.xml'.
* Added an 'RDMulticaster' class.
* Added an 'mcast_recv_test' program in 'tests/'.
* Added a 'SYSTEM.NOTIFICATION_ADDRESS' field to the database.
* Incremented the database version to 276.
* Added an 'Mcast Address for Notifications' control to the
'System-Wide Settings' dialog in rdadmin(1).
* Implemented the 'Process Notification' ['ON'] command in
ripcd(8).
* Added an 'RDRipc::sendNotification()' method.
* Added an 'RDRipc::notificationReceived()' signal.
* Added a 'SYSTEM.SHOW_USER_LIST' field to the database.
* Incremented the database version to 265.
* Added 'RDSystem::showUserList()' and 'RDSystem::setShowUserList()'
methods in 'lib/rdsystem.cpp' and 'lib/rdsystem.h'.
* Added a 'Show User List in RDLogin' control to the 'Edit System'
dialog in 'rdadmin/edit_settings.cpp' and 'rdadmin/edit_settings.h'.
* Altered RDLogin to display a text input field for the user name
when 'Show User List in RDLogin' is unchecked.
* Added a 'SYSTEM.FIX_DUP_CART_TITLES' field to the database.
* Incremented the database version to 264.
* Added 'RDSystem::fixDuplicateCartTitles()' and
'RDSystem::setFixDuplicateCartTitles()' methods in 'lib/rdsystem.cpp'
and 'lib/rdsystem.h'.
* Added an 'Auto-Correct Duplicate Cart Titles' checkbox to the
'System Settings' dialog in 'rdadmin/edit_settings.cpp' and
'rdadmin/edit_settings.h'.
* Modified the 'EditCart' web call to enforce the 'Auto-Correct
Duplicate Cart Titles' setting.
