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In quiet mode e.g. "apk info -q -W <file list>" a list of dependencies
suitable for .PKGINFO is output in one line.

dependencies are separated with single space rather than ', '.
makes db file slightly easier to parse from a shell script which
might be handy.

This reverts commit b852d670.

Each dep is separated with a single space. I.E:

D:dep1 dep2 dep3

Make the db of installed packages more similar to index file and
reuse the code. Also rename the database file.

Checksum of installed is computed on the fly when extracting them
and it'll be saved to fdb. When installing config files those are
diverted with suffix .apk-new if earlier version of same file with
local changes exist.

other stuff.

breakage and major changes.