[m-rev.] for possible review: tidying up reference manual

[Zoltan Somogyi]

Most of this is boring, such as showing sentence structure
through indentation (in the .texi file, not in the generated .html or .pdf),
adding missing commas, and fixing typos.

The one substantial change is commenting out a paragraph that said that
solver types couldn't be defined in interface sections. I commented that out
because the compiler accepts that without complaint.

Zoltan.
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