Use 65535 as scale factor for color-values on NS

[Mattias Engdegård]

Alan, it seems that only NS uses 65280 as scale factor for 'color-values'; all 
other back-ends use 65535. Do you know if there is any reason for keeping it 
this way? Otherwise, I propose we change it (see patch).

It is probably just a relic from when colour components were scaled from 8 to 
16 bits by multiplication with 256 instead of 257; this seems to have been 
fixed everywhere else.

0001-Use-65535-as-color-values-scale-value-in-the-NS-back.patch
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