* Cleanup libddr_lzma flags and memory handling; support sparse
input. Default preset to 4 now.
* Detect sparse output from unsparse plugins (decompression
and decryption may benefit from this).
* Testcase for (de)compression with sparse files.
* Fix calchmac.py for Python 3.12, so HMAC tests succeed again.
* Rationalize log level handling (control by -q, -v, -E).
* Move cache prefetching fomr plugins to main program.
OBS-URL: https://build.opensuse.org/package/show/Base:System/dd_rescue?expand=0&rev=87
