Changed the directory that the File Open dialog opens in during
Open Card... menu item processing from hamqsler to the default
card file folder.
Added Creating a New Card, Card Design Related Menus and Menu Items,
Highlighting and Selecting Card Items and Deselecting Card Items
sections to the user manual. Added stub sections to provide links
from one or more of the new sections. Performed minor edits elsewhere
in workingwithcards.xml.