v1.5.1: fixed showing Facebook/MSN avatar images in chat HTML export;
- not showing author name for consecutive messages in chat HTML export;
- emoticon texts shown transparently over icon in chat HTML export;
- fixed message times in chat HTML/TXT export (was showing hour:second);
- improved message and emoticon parsing;
- fixed wrong items shown in file transfers under chat statistics;
- minor changes in UI layout and logic.