Mainly bug fixes and code restructuration

  => Orange 3G was never set on the chart
  => Unknown network class went consistently to Orange2G use percent or FreeMobile 3G use percent.
  => Improved STAY_STICKY kitkat workaround, but still poor chance that it will work.
  => Tried to fix incoherent percentages sums. 33 + 33 = 65
+
Splitted PieChart and MobileNetworkChart for a more modulable code.