Lyapko George's ECO v1.0
This utility reads in pgn-file (moves MUST be not commented) and creates another pgn-file
adding for each game ECO and opening name (if it is possible).
Command line:
LGECO In.pgn Out.pgn [startECO] [endECO]
Parameters in square brackets are optional.
For example, 
LGECO 1.pgn 2.pgn C37 C41 
will create 2.pgn containing only games with ECO C37,C38,C39,C40,C41
