Some (minor) problems with x5250 0.4.8

Hallo James,

I finally got x5250 compiled and tested a little. I found no big problems, but 
there are two minor issues which stop me from using it in production.

1. 80 <-> 132 columns switching
After switching between the modes some sreen areas remain uncleared. It looks 
really bad. I can provide some screenshots. It looks like clearing screen 
before mode switching would be a good idea.

2. missing Polish-specific keybindings
I get messages like "keysym aogonek is not handled". There are 18 
Polish-specific characters (9 chars times 2 - upper and lowercase) which I 
need to use. These are generated by ALT_R+letter combination. 
How can I add support for these characters? I guess it must be quite easy but 
I don't want to invent the wheel myself... 

I have also a 'would be nice' suggestion: my users prefer to mark data for 
copying (usually one field) with ALT+cursor keys, they also use CTL-C / CTL-V 
for copy / paste. Is it currently possible to  get such keybindings? If not - 
could you consider adding theese features?

BTW - I have ca. 100 users working with xt5250 for about two years. I would 
switch to x5250 as soon as we get all mentioned features working.

Best regards

Marek Bajon