More license updates

Clarify some license notices to specifically refer to GPLv2+ instead of only
referring to GPL without version. (Most of the sloppy license headers slipped
in unnoticed; the changes were acked by Felix Blyakher <felixb@sgi.com> on
behalf of SGI on 8 April 2009.)

Add license headers to a number of small files which were only licenses as
GPLv2+ implicitly so far.

Refer to this package as "this program" rather than "Attr" throughout the
license notices; this simplifies sharing files among packages.

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