More Accurately Calculate Which Tags Are Popular

[MitchellMcKenna]

• When requesting tags, only those of a published posts will be
  returned.
• tag_model get_all_tags() will calculate the number of items tagged
  dynatmically.
• The column count of the tags table is unnecessary, the column and
  related code will be removed when the database migration tool is
  built.

Refs #38

[therourke]

OK. I took the jump and added this new code. The tag cloud appears to be different, better. Great stuff. Anyway to have more items show in this by the way?

What hasn't changed though is the tag count in relation to the pages generated for each tag. So, if I go to the 'art' tag, my stream still thinks there are 800 items, rather than 80, so it generates enough page links at the bottom of the stream for 800 items. Pressing on page number '16' therefore leads to a page with nothing in it. You can see the page I mean here, scroll to the bottom and try out the generated page links: http://machinemachine.net/stream/items/tag/art

Does this make sense? Thanks

[MitchellMcKenna]

@therourke I was unable to reproduce your tag pagination issue, but I pushed up a potential fix, please checkout the develop branch and if your still seeing the issue please open a different issue for it so I can help debug it with you. I've also created issue #47 to add an option to the admin section for how many popular tags show up.