spin 1.70

I decided to start overhauling my Usenet article format page a bit since I'm working on the USEFOR draft again, and decided that finding the size of each file to indicate the size next to links (which the IETF pages do and which I think is cool for an at-a-glance feel of the size of specifications) was tedious. So this version of spin now supports a \size command, which inserts the size in bytes of a local file. It automatically scales the units to produce a nicely readable number.

I also made the error handling of a botched macro definition a little less spectacular in its failure, although it could still use work.

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