Add an item to the HTML navigation file.
AddNavItem(Rcommand,navcon,listname,navindex)The current R command in the script file.
The connection for writing to the navigation file.
The name of the listing file.
The number used to generate the name tag.
The name tag to link the listing to the navigation entry.
AddNavItem adds an entry to the navigation file, generates a name tag for that entry and returns it to be inserted into the listing file. If the R command is longer than 20 characters, it is truncated to 18 characters and an ellipsis appended.