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(AC_COPYRIGHT): Factor header comment portion out and move into... * lib/m4sugar/m4sh.m4 (AS_COPYRIGHT): This. * lib/autotest/general.at (AT_COPYRIGHT): New macro. (AT_INIT): Add Autotest copyright notice. Display copyright notices in --version output. * tests/local.at: Add Autoconf test suite copyright notice. * doc/autoconf.texi (Writing testsuite.at): Document AT_COPYRIGHT. * NEWS: Mention AT_COPYRIGHT.