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Update GPL 2.0 text including postal address

Verbatim from https://www.gnu.org/licenses/gpl-2.0.txt
Fix function name logging for db queries
CSS: Remove uppercase transform on menu headings
Fix #17715: Manage Config should trim option name
phpdoc compress_api.php: remove incorrect @uses statement
Hide attachments in history if user can't see them

If user is not allowed to view attachments (i.e. their access level is
lower than $g_view_attachments_threshold), then the history should not
display information about attachments.

Fixes #17744