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f2c1f3b9 - Move gnulib-tool invocation back from autopull.sh to autogen.sh.

Move gnulib-tool invocation back from autopull.sh to autogen.sh. * autogen.sh: Revert most of last change. Improve comments. * autopull.sh: Only call 'gitsub.sh pull', fetch archive.dir.tar, and recurse. * libtextstyle/autogen.sh: Revert most of last change. Improve comments. * libtextstyle/autopull.sh: Only call 'gitsub.sh pull', fetch texinfo.tex. * libtextstyle/m4/init-package-version.m4: Revert last change.