Major theme cleanup and rewrite. This site validates as HTML5 and CSS3 now.

The new theme is based entirely on new tags, like article, section, header, footer etc. which permitted me to abandon all the div and span tags.

I'll publish the new Theme in several days, if it proofs itself as bug-free. However it is still a work in progress.

UPD: uploaded new theme to CVS along with some improvements in backend.