Fixed Issues since Linux Mint 18 BETA

All editions
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	mintsources: warning text uses hardcoded color (looks wrong in mint-y-dark)
	mintdrivers: grey font not readable
	Optimus Graphic: When right clicking on nvidia icon, the menu pops up in the top right
	mintbackup just hangs indefinitely when you try to restore software selection, terminal has no output, and mintbackup is using no cpu.

Cinnamon Edition
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MATE Edition
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KDE Edition
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Xfce Edition
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