spin 1.54

In building my new book review site, I found that I was duplicating the same macros over and over again on different pages. I've now added a rudimentary \include functionality to spin. At some point it will have to be seriously redesigned, since right now it has a lot of annoying limitations, but this approach was easy.

While I was in there, I also fixed a couple of bugs: image tags shouldn't always have newlines after them, since that makes them look strange inside links, and user-defined macros and strings weren't being cleared after each file when processing a whole tree.

You can get the latest version from my web tools page.