[9fans] xd bug

[Pietro Gagliardi]

Hello. Regarding my previous question, the file /n/sources/contrib/ 
pietro/xd.out shows a bug in xd regarding characters that can't be  
printed with the %c format. There should be no space between a non- 
printing and a printing character; but the two spaces screw the rest  
of the line up. This shows a deficiency in the table-based  
implementation. I'll do my best to fix it in a clean way. Thanks.