Support more LiquidCrystal displays out of the box

Previously, the row offsets were hardcoded to the ones used for 20x4
displays (which woudl also work for all 2-line displays). Now, the
number of columns given is used to calculate the offsets most likely to
apply.

For 2-line displays and 20x4 displays, the (used) offsets are completel
unchanged. With this change, common 16x4 displays and (if they even
exist) other 4-line and 3-line displays might also work (depending on
the hardware configuration used, of course).

See this page for some info on common LCD sizes and configurations
encountered in practice:

http://web.alfredstate.edu/weimandn/lcd/lcd_addressing/lcd_addressing_index.html

Author: matthijskooijman

libraries/LiquidCrystal/src/LiquidCrystal.cpp

@@ -79,8 +79,6 @@ void LiquidCrystal::init(uint8_t fourbitmode, uint8_t rs, uint8_t rw, uint8_t en
   else 
     _displayfunction = LCD_8BITMODE | LCD_1LINE | LCD_5x8DOTS;
 
-  setRowOffsets(0x00, 0x40, 0x14, 0x54);  
-  
   begin(16, 1);  
 }
 
@@ -91,6 +89,8 @@ void LiquidCrystal::begin(uint8_t cols, uint8_t lines, uint8_t dotsize) {
   _numlines = lines;
   _currline = 0;
 
+  setRowOffsets(0x00, 0x40, 0x00 + cols, 0x40 + cols);  
+
   // for some 1 line displays you can select a 10 pixel high font
   if ((dotsize != 0) && (lines == 1)) {
     _displayfunction |= LCD_5x10DOTS;