extfs performs absolutely poorly on solid archives

[birdie]

Testcase: create a solid RAR, ACE, or 7Z archive with a directory containing a thousand files in it.

Try to extract the last say 10 files from this archive or a directory containing all the files.

urar, u7z, and uace will unpack this archive 10 or 1000 times to extract 10 files or the whole archive and that will take an insane amount of time.

Midnight Commander should be rewritten in such a way so that extfs handlers could prepare a list of files and pass this list to archiver.

[andrew_b]

Duplicate of #3.