[PATCH] Stop 'svn import' from creating empty revisions (v4)

Stop 'svn import' from creating empty revisions, and organize
the import tests into a separate test script.

* build.conf
  Added import_tests.py to the list of test scripts.

* subversion/libsvn_client/commit.c
  (import_ctx_t) : New import context struct suggested by
    C.Michael Pilato. Currently only the repos_changed boolean
    is used to remember if changes were made to the repository.
  (import_dir) : Added an extra function parameter - 'import_ctx'.
    Set repos_changed to true if files or directories are added
    to the repository.
  (import) : Set repos_changed in the import_ctx to true if
    parent directories are added, or if a file is added.
    Abort an edit if no files or directories were added to the
    repository.

* subversion/tests/clients/cmdline/basic_tests.py
  (basic_import_executable) : Moved to import_tests.py.
  (basic_import_ignores) : Moved to import_tests.py.
  (test_list) : Removed 'basic_import_executable' and
    'basic_import_ignores' from the list of tests.

* subversion/tests/clients/cmdline/import_tests.py : New.
  (import_executable) : Previously basic_import_executable in
    basic_tests.py.
  (import_ignores) : Previously basic_import_ignores in
    basic_tests.py.
  (import_avoid_empty_revision) : New. Verify empty revisions
    cannot be created during an import.
  (test_list) : Added 'import_executable', 'import_ignores',
    and 'import_avoid_empty_revisions' to the list of tests.

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