Following MDL-11992 commit, we will need to improve the integration of the initial course tagging patch with the rest of the tagging system. Among things that need to be improved:
1) use of "hardcoded" font-style - course tagging uses dynamic css font-size plus: better mathematical distribution, minus: harder to theme) while tags uses s?? classes -,
2) the choice of "tag type" in the block (all, mine, course, official, community)
3) push back into /tag/lib.php as much common code as possible