Updated the README
Update of TODO.org, it was a long time ago
Moved ?PAIRS closer to IF and friends
Updated module comment for Language.Forth.Interpreter.DataField
Added ALLOT, 2*, CELLS, CELL+, VARIABLE, DECIMAL and HEX.
Updated comment for cell words.
Added CHAR, CHARS, CHAR+
Added 2!, 2@ and COUNT
Interpreter can now read negative numbers.
Added PAD for the interpreter.