pad is now defined like in fig-forth!

Not sure why I had a static buffer before...

Now I can use pad for chat over usb and serial, instead of allocating other
buffers.

startup.mu4

@@ -830,7 +830,7 @@ ctrl M  constant #CR   --  13
 ( Since we're putting "thousands" separations in here as well, I thought I
   might increase the size to an over-generous 128 bytes.)
 
-128 allot  here constant pad   ( 64 digits + sign + alignment)
+: pad   here 128 + ;  ( 64 digits + sign + alignment)
 
 variable hld
 : hold   -1 hld +!  hld @ c! ;