Processing of PDF publications with inaccurate metadata

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It is common case when PDF publication has inaccurate metadata (e.g. author and title). To solve it lib2opds provides sidecar metadata files support. The problem is cover extraction is also made inside metadata extraction and with using of sidecar files covers will be lost.

Possible workaround is to use metadata from sidecar file as default values for publication so lib2opds can extract cover as well. It is important to provide option to force using only data from sidecar files (because proper data can be overwritten with inaccurate information).