v2.1: support for exporting and comparing very large chats;
- fixed errors on selecting chat participants in chat history;
- fixed errors for chats with empty names;
- fixed data grids freezing if moving mouse over certain BLOB fields;
- added partner skypename to chat lists' People column for 1:1 chats;
- started remembering last active page in database tabs;
- improved exporting binary data as SQL from database tables;
- improved wxMac compatibility.