[guppi-list] More (minor-ish) bugs

[Neil J Pilgrim <eennjp electeng leeds ac uk>]

You probably already know about these, but anyway:

- 'Home' operation on scatter plot does not include maximum size of
elements when calculating range to display.
- Scatter-plot configure box does not display once it is selected - it
needs some clicks over elements for all of it to redisplay correctly.
- zooming on individual axes no longer works?
- linked views currently broken.

Enjoy...

-- 
Neil