Rename tag 'Pages' to 'Page' in meta.txt

This is to avoid a confusion with the number of pages.
The tag indicates the position of the extract in the parent file,
using either a single page number or a range of page numbers.
Remove appendixes with reviewers for 1994 Special Report

'Reviewers' is a much broader category, distinct from 'Review Editors'.

It has been decided to let it aside, because it represents a very
large number of persons, with variable degrees of implication,
and documented inconsistently from AR to AR and SR to SR.