* Add support for format option.
* Improve private key format detection.
* Fix raw format handling.
* Improve error handling.
* Improve raw key handling.
* Add failed raw test.
* Improve raw key loading.
* Simplify tests.
* Add raw format tests.
* Fail if format != 'auto_ignore' is specified for pyopenssl backend.
* Fix quoting.
* Bump version.
* Allow to convert private keys between different formats.
* Improve description.
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