Flush the logfile reasonably frequently in `printable output only' and

`all session data' modes, without completely mauling the performance, by
fflush()ing once per term_out(). If anyone complains I suppose we can
make this optional.

[originally from svn r4445]

terminal.c

@@ -3311,6 +3311,7 @@ void term_out(Terminal *term)
     }
 
     term_print_flush(term);
+    logflush(term->logctx);
 }
 
 #if 0