The functions for displaying the list of identified items begin by
prompting for the category of item, using msg(). Rogue V4 left this
prompt on the screen after displaying the discovery list. Rogue V5
erased the message window even if the process of printing the list
created another message which the player had not read.
Messages are now cleared in endline(), which is capable of checking
whether clearing should be done.
Though it was called with different numbers of arguments, add_line()
does not need to be a variadic function. Making the second argument
mandatory is a better solution.
Converting all function definitions to ANSI style accounts for most of
the change. This has exposed other problems, such as daemons not
actually being their stated type, that will require more careful
solutions.
