Re: Missing biblio

[John MacFarlane <jgm-TVLZxgkOlNX2fBVCVOL8/A@public.gmane.org>]

Thanks (and apologies if I missed the files before).

Simple repro here:

```
hi[^fn3]

[^fn3]: [@Alhazen1572-qk, V.9]: "competentius est et rationabilius, ut appareat supra perpendiculum, quam extra eam."
```

This yields an empty footnote.  Why?  Because the footnote
contains:

```
[@Alhazen1572-qk, V.9]: "competentius est et rationabilius, ut appareat supra perpendiculum, quam extra eam."
```

which pandoc is parsing as a reference link definition!

Perhaps pandoc should not allow reference link definitions
that start with `@`, since these conflict with citations?
Anyone have thoughts about this?  Someone should probably
put an issue on the bug tracker for this.

In the mean time, a workaround is to backslash-escape the
colon:

    [@Alhazen1572-qk, V.9]\: "competentius...