gnulib-tool.py.TODO

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Bugs:
  - error message missing when gl_DOC_BASE missing
    https://lists.gnu.org/archive/html/bug-gnulib/2024-04/msg00160.html

Various other refactorings, as deemed useful:
  - Use an enum for 'all', 'old', 'new', 'added', 'removed' in GLImport.py.

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