Factor out common code in printBlogPostEntity.
edit comment using vim
Get comment files for an extracted blog post.
Add comments from files.
Delete comments when deleting a post.
set comments visible/invisible
Keep accented characters in post titles.
A blog post is Html, not Text!
whamlet for comments
Fixing utils/utils.hs to deal with the Html data type for blog content (as opposed to Text).

Main points:

* Had to do "toHtml $ TB.preEscapedToMarkup" when reading in a blog
  post in an export file, so stop HTMl tags from being escaped.

* Had to use "renderHtml" and "BSL.writeFile" to dump a blog post to
  a file for editing with vim.