Reinstate Reference Manual's list of theorems

[mn200]

The Reference manual used to include a big list of the core system's theorems. I found this useful when I was learning HOL, so perhaps we should try to do this again. It's not clear if we'd really want to list all theorems, even for just the core theories, but I guess a tool that included all theorems from specified theories except for ones that a developer somehow flagged as 'uninteresting' would be the way to go.

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[mn200]

The flagging of theorems, whether white-listing (with associated categories?) or marking as interesting could obviously be done with theorem attributes.