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instead added an overload that doesn't take any arguments.  I did this
because -O3 sometimes makes gcc ignore more complex default arguments.
I don't actually have any cases where this happened to this function
but I'm changing it just to be safe.

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Intel compiler.

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without them you get errors when compiling with the Intel compiler.

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    the implementation do recursive feature elimination when the user tries to
    rank all the features.
  - The report format that comes out of the rank_features() function is now
    also slightly different.

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sometimes.

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into the old change logs section.

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You can now adjust how much it scrolls when the mouse wheel is scrolled
as well as enabling scrolling via a mouse drag.

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some extra mutex locks to the global singleton in the gui core.

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since this is now mostly untrue.

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objects at the global scope

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and also made the dlib thread pool not block the termination of the program
if there are still threads executing.

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argument that lets you know the status of any buttons currently
depressed

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some versions of gcc don't end up doing the right thing when -O3 is supplied.

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