Version 0.3a2 (bug fixes, additions, etc)

Bug Fixes (a move after undo invalidates redo, gamed-over replays behave as such when exiting replay-mode)
Additions (count of available redo moves -if any- added in moves-counter)
New replay-files format (added iswin field in GameState struct)
New sample replay-files
Improved Readme.txt
A bit less outdated inline comments