Tentative merge of ben-mac-port (only dead for three years!) into the trunk.

This doesn't include any mkfiles.pl glue, and is missing one or two other
fixes.  The terminal emulator is kind of working, though, as, I believe, is
the store module.  Everything else is yet to be done.

[originally from svn r2226]

puttyps.h

@@ -6,6 +6,10 @@
 #include <windows.h>
 #include "winstuff.h"
 
+#elif defined(macintosh)
+
+#include "macstuff.h"
+
 #else
 
 #include "unix.h"