heads-up: 38 cleanup-maint patches

[Jim Meyering]

I will soon push the following clean-up patches.
It was nearly 400KBuncompressed, so I'm attaching the compressed version:

      maint: update bootstrap from gnulib
      maint: update build/gnulib infrastructure; generate ChangeLog
      maint: update autogenerated .gitignore files
      maint: remove all trailing white space
      maint: update copyright dates; use gnulib's update-copyright module
      maint: convert obsolescent @VAR@ notation to $(VAR)
      maint: begin to modernize configure.ac
      maint: do not version-control generated files.
      maint: remove ACLOCAL_AMFLAGS in favor of AC_CONFIG_MACRO_DIRS
      maint: .gitignore: ignore more
      tests: hook up gnulib-tests
      maint: add cfg.mk, derived from grep's
      maint: generate THANKS from THANKS.in
      maint: turn on the test that prohibits use of HAVE_CONFIG_H
      maint: add .prev-version
      doc: remove doubled word
      maint: enable double-word prohibition
      maint: enable sc_const_long_option syntax check
      maint: enable more checks
      maint: enable sc_program_name syntax check
      maint: enable sc_space_tab syntax check
      maint: enable sc_makefile_at_at_check syntax check
      maint: enable sc_prohibit_always_true_header_tests syntax check
      maint: enable sc_po_check syntax check
      maint: enable sc_cast_of_alloca_return_value syntax check
      maint: enable sc_cast_of_argument_to_free syntax check
      maint: enable sc_m4_quote_check syntax check
      maint: enable sc_prohibit_tab_based_indentation syntax check
      maint: enable sc_prohibit_empty_lines_at_EOF check
      maint: avoid false-positive used-uninit. warning from gcc
      maint: avoid gcc warning about unused macro
      maint: declare several "int" locals to be of type size_t
      maint: manually convert K&R to ANSI style decls; and add "static"
      maint: add _Noreturn attribute to two functions
      maint: avoid more gcc warnings: apply _GL_ATTRIBUTE_PURE
      maint: avoid a gcc "const discard" warning
      maint: add three casts-in-initialization to avoid warnings
      build: use gnulib's manywarnings module

sed-cleanup-38.patch.xz
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