Diskette

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* Minor fixes in Makefile, documentation and Pytest adopted options;
* Implemented loaddata option ``ignorenonexistent``;
* Added support for Django 5.0;

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* Added option ``--exclude-data`` to ``diskette_load`` to exclude some dump filenames
from loading;
* Added setting ``DISKETTE_LOAD_MINIMAL_FILESIZE`` to filter out dumps with file size
under the size limit;

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* Added options ``--app`` and ``--exclude`` to ``diskette_apps``;
* Removed forgotten debug print from dump code;

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* Added option ``--check`` to ``diskette_dump`` to perform validation and checking
without to query database or writing anything onto filesystem;
* Added option ``--format`` to ``diskette_apps`` with additional ``python`` format
which is now the default one instead of ``json``;
* Changed ``diskette_dump`` and ``diskette_load`` so they output Diskette version
as an early debug log message;

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* Added support of archive URL to download in ``diskette_load``;
* Added options for archive checksum creation and comparison in ``diskette_load``;
* Added option for archive checksum creation in ``diskette_dump``;
* Improve handlers test coverage on options;

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Fix release for missing commandline script from package.