Balto-Slavic glottal stop

I moved the entry to Appendix:Proto-Balto-Slavic/mauras.

I added an "alternative reconstructions" section. I don't think any other entries have it yet, but I think it can be useful to make clear that there are different possible ways to interpret it. I haven't turned it into a link because it's just a redirect anyway (as alternative reconstructions usually are, unlike alternative/inflected forms which get entries). Could you add a <ref> to it as well?

Even with the "Alternative reconstructions" section, isn't it still proper to denote the laryngeal with *H and to use *a instead of *o? (In other words, giving the listing under "Alternative reconstructions" as *mauHras)

We can list both if necessary. I'm pretty sure both symbols are used.

I like the ===Alternative reconstructions=== header. We should use it for PIE as well.

I think it would be good for disputed reconstructions and not notational differences.