[NTG-context] \hairline in the header and column rule

[Jeong Dalyoung]

Dear Aditya

Thank you for your tip.

After adding the line "\setupbackgrounds[header][text] 
[bottomframe=on,topframe=on]", I got lines of whole length.
However, [rule=on] option only draw vertical line as long as the  
paragraph not to the bottom.

Please test once more using a short paragraph(3-4 lines) instead of  
\knuth.

Thank you again.
Regards,

Dalyoung