[argyllcms] Chartread mode

There is online switch between strip and patch-by-patch mode needed. My 
instrument is Eye-One Pro.
In some cases I have to measure a complex targets. For example the targets with 
damaged surface or with unpredictable behavior of print process but without 
spacers between patches (some materials are very expensive). In such cases most 
samples are readable in strip mode, but several strips are not. In such cases I 
have to read all charts in patch-by-patch mode. If the number of patches as 
high as 200 or more, spot reading is a problem.
In other cases, after successful strip reading, I have a scruples - the 
instrument ruler was misplaced and Eye-One may take neighbor strip patches by 
device aperture. So, I want to repeat this strip. But if the chartread decide 
the strip successful, I can't repeat the strip I doubt.

In all cases I'll be happy to press "patch-by-patch" switch key on keyboard, 
select the patches needed with keys "back" and "forward", read difficult 
patches spot-by-spot and switch back to strip mode.
Another useful feature may be the keys "back" and "forward" in strip mode.

I'm not familiar with programming and have no chance to rewrite and compile 
chartread myself...

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