Support correctly reading copyright statements

[rhdunn]

Copyright statements have the form:

Copyright (C) 2009
Copyright (C) 2008-2010
Copyright (C) 2004, 2008
Copyright© 2013

which all share a common format:

COPYRIGHT := 'copyright' (('(' 'C' ')') | '©') ((YEAR | (YEAR '-' YEAR)) ~ ',')

The Copyright (C)/Copyright© portion should just be read as "copyright". The YEAR '-' YEAR portion should be read as "YEAR to YEAR".

Here, the YEAR items are numbers that are read as years as outlined in issue #44 (date/time support).

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