This reverts commit bc773adb.

Fixes #198

Process inline attachments in thread entry and support inline images in
piped emails

Support inline images across the system, with draft support

Migrate to a single attachment table
    That way we don't need a new table for everything we need to attach an
    inline image to (like a signature, for instance)

Add richtext support for internal notes

Implement images on site pages

* Image paste in Redactor
* Make non-local images optional
* Placeholder for non-local images
* Fix local image download hover
* Don't re-attach inline images

  - Logo selection radio buttons not vertically centered (Firefox)
  - font-size value incorrect in login.css
  - Incorrect : placement in FAQ category edit
  - Incorrect block width declaration (700 vs 700px)
  - Browsers disagree on the placement of CSS3 outline properties
  - Correctly place check boxes and radio buttons