Fixed Issues since Linux Mint 17.2 RC

All editions
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	[in git] mintsources: New PPA archive package browsing. You don’t see if a package is already installed. Checkbox is always empty if you reopen the package list. No error when you install “again”.
	[in git] mintsources: PPA package list should be modal. One wrong click and the window is behind the non responding sources window.

Cinnamon Edition
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	[in git] little issue with Settings stacks: https://github.com/linuxmint/cinnamon-control-center/issues/120


MATE Edition
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