Changes

New environment for non-normative content without delimiting paragraph breaks

When using the nonnormative* environment, it is the author's responsibility to ensure that the content doesn't mix with other paragraphs.  The main use at the moment is in tables, where there shouldn't be a paragraph break before the line break at the end of a table row.

Move highly redundant non-normative text regarding operator record to separate paragraph

Clean up non-normative content in classes.tex