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mktables: Move 'format' to base class
This patch is in preparation for adding more complete annotations to the
output tables. Previously, only Map tables had a listed format. Match
tables also have a format (empty), but that was understood. But the new
annotation code will need to refer to that format, so I moved the field
into the base class common to both types of tables, and added the
EMPTY_FORMAT for use by Match tables.