Many improvements

• Use capacity between NominalFullVoltageMillivolt and CutoffVoltageMillivoltHigh as standard capacity to enable better comparison.
• If powered by USB plotter pin logic is reversed, i.e. plotter output is enabled if NOT connected to ground.
• In state detecting battery, you can toggle cut off voltage between high, low and zero (0.1 V) with stop button.
• Fix bug for appending to compressed data.
• Synchronizing of LCD access for button handler, avoiding corrupted display content.
• Print improvements.
• Support for storage period of 120 s.
• Compression improved for rapidly descending voltage.
• Moving seldom used function of pin 10 to pin A5.
• New Logger mode with separate shunt enabled by pin 10.
• Store data in an array of structure instead in 3 arrays.