three new features for the message window we discussed:
- Graying out lines that are old -- slightly cleaner than <Someone>'s version.
- Message concatenation.
- --More-- prompt if there are more messages this turn than fit in the
window.
As a by-product of these changes, some other things have changed, too:
- The message lines array is now used in a round-robin way, i.e. the
messages are no longer copied one line up when adding a new message.
- clear_nhwindow no longer redraws the window, which significantly
reduces screen flicker.
- A caret bug was fixed.
- The last line is no longer highlighted, as this seems unnecessary
since the most recent messages are in a different colour
- A bug was fixed that caused two lines too many to be drawn on each
paint.
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