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Also fixes the basename offset for highlighting the basename.
Closes #379.

Based on: http://stackoverflow.com/questions/6788274/ios-mac-cpu-usage-for-thread
and       https://github.com/max-horvath/htop-osx/blob/e86692e869e30b0bc7264b3675d2a4014866ef46/ProcessList.c
This should be a fix for #361.