Updated the comment system

Today I found some time to make updates to the comment system on this weblog. I upgraded to the latest nbcom version and modified the source a lot to fit my needs - basically. I'm not very satisfied with it by now, but it should at least do the desired task more properly than the previous version.

Anonymous commenting with some basic captcha stuff is now also available.

I don't really know, why I still stick with nanoblogger and nbcom as both projects don't seem to be supported anymore and when thinking about the pile of work still todo, I'm asking myself if fixing my blogging-engine really is that important instead using something more sophisticated...