Cleanup yon-post struct.
Clean up post struct more.
Add yon-format-post-image function.
Add image filename to header.
Add whitespace and make post header stand out a bit more.
Pressing enter on an image link opens it in a new window.
Fix yon-format-post-header.
Fix a couple of unit tests so that the build is a little less broken.
Output useful message
Floor the post image number before converting to string.

This avoids a mysterious bug that appears on some people's machines
with floating point numbers (that shouldn't even be floating point!)
Merge branch 'images' of github.com:davexunit/yon-chan into images

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Try truncate instead of floor.
Fix number conversion on 32-bit systems
Merge pull request #10 from davexunit/images

Basic image support