LiquidCrystal robustness and test (#3369)
* LiquidCrystal I2C 4-bit robustness - Fix up some formatting - Initialization is now more conformant with the datasheet. - Read-backs don't needlessly (or erroneously!) store back While here, document some unexpected behaviour of read-back commands. * liquidcrystal i2c 4bit NTest
tests/NTest_lcd_i2c4bit.lua
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