Force flush when writing progress indicator.

src/main/scripts/bin/export.lua

@@ -28,6 +28,7 @@ while true do
         local bytes = {string.byte(str, 1, -1)}
         device:writeExportFile(bytes)
         io.write(".")
+        io.flush()
     end
 end
 io.write("\n")

src/main/scripts/bin/import.lua

@@ -27,6 +27,7 @@ while true do
     if #bytes > 0 then
         file:write(string.char(table.unpack(bytes)))
         io.write(".")
+        io.flush()
     end
 end
 io.write("\n")