Increased scroll back and turned status line on

Finding that I get a bit lost when I have 6+ windows open, so added back the
hard status line. Wasn't entirely sure if I wanted to make it fancy, or just
stick with the absolutely boring stock colors, so left a more advanced snippet
in there in case I wanted to use it later.

screenrc

@@ -1,2 +1,4 @@
 startup_message off
-defscrollback 50000
+defscrollback 1000000
+hardstatus alwayslastline "%w %= %S"
+# hardstatus string "%{.kW}%-w%{.bW}%t [%n]%{-}%+w %=%{..G} %S"