Testing better compatibility with Linux wxPython.
Changed database detection to using event callbacks (issue #7: background threads must not change UI under Linux); small UI changes for better Linux view.
v1.4: added statistics and word cloud to chat HTML exports;
- added option to export selected chats only;
- added calls to chat statistics;
- added support for automatic updates;
- added possibility to send feedback;
- added option for automatic error reporting;
- statistics for chat text collected from text messages only;

- rearranged program menus;
- improved Linux compatibility;
- started using templates for generating content;
- updated license information for used and included software;
- upgraded BeautifulSoup from 3.2.0 to 3.2.1;
- updated 48x48 and 64x64 icons;
- multiple minor fixes and re-factorings.