Second release soon

Second release changes are ready and are being intensively tested.

The changes includes:
- full screen available (when one file opened),
- up to 3 files opened the same time,
- easier program configuration (it prompts for needed configuration data - UnRar and 7-Zip executables),
- configuration saved to one file only (binary),
- configuration compatible with previous version (reads old files, delete them, writes new file),
- better memory usage - only scaled images are stored - original size images are read each time they are needed,
- configuration panel fix,
- some bugs fixes.

The changes will be available soon in download section - but you can still use/download current version (3.0) - new version will be fully compatible.