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d39798e8 - Split autogen.sh into autopull.sh and autogen.sh.

Split autogen.sh into autopull.sh and autogen.sh. * autopull.sh: New file, based on autogen.sh. * autogen.sh: Remove code that was moved to autopull.sh. Remove --skip-gnulib option. * HACKING: Mention autopull.sh. * libtextstyle/autopull.sh: New file, based on libtextstyle/autogen.sh. * libtextstyle/autogen.sh: Remove code that was moved to libtextstyle/autopull.sh. Remove --skip-gnulib option. * libtextstyle/HACKING: Mention autopull.sh. * libtextstyle/m4/init-package-version.m4: Update comment.