this allows non-root users to query the database.

But we dont bother try create all subdirs (i.e mkdir -p ...)

Currently only implement --backup to get list of (config) files in
protected directories to backup.

This also fixes a database corruption bug in database.c.

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.

Defaults to /etc/apk/repositories, absolute path and not relative
the install root.

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.