Fix up the one liners to be more consistent with the other blocks.

Fix up the one liners to be more consistent with the other blocks.

- Move the html_pre and html_post options for one liners into the block.
- Add support for suppressing printing of block names, use this for one
  liners.
- Move procesing of html_pre and html_post options to apply to all block
  types.
- Fix block type "sub" to support result_html, and if no result_html is
  present to just use the result output.