LiquidCrystal: One bugfix in setCursor and change all atributes from private to protected#37

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netmaniac wants to merge 2 commits intoarduino:masterfrom

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Commits on Jul 28, 2011

Change private to protected allows to create derivated classes with changed functionality (like new row offsets for 4x16 LCDs in setCursor)
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Fix for case when row is 4 - then setCursor would access row_offsets[4]
netmaniac
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