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Calculate changesets directly by stabilizating the package graph instead of
recalculating the whole graph and then diffing (similar approach as seen
in 'smart' package manager). The algorithm is not complete: defferred
search space forking is missing. So you don't always get a solution on
complex graphs.

Benefits:
- usually the search state tree is smaller (less memory used)
- speed relational to changeset size, not database size (usually faster)
- touch only packages related to users request (can work on partitially
  broken state; upgrades only necessary packages, fixes #7)

Also implemented:
- command prompt to confirm operation if packages are deleted or downgraded
- requesting deletion of package suggests removal of all packages depending
  on the package being removed (you'll get list of packages that also get
  removed if you want package X removed)
- option --simulate to see what would have been done (mainly for testing)
- an untested implementation of versioned dependencies and conflicts

A lot has changed, so expect new bugs too.

So we don't get artificial limits on the amount of dependencies
(fixes #8).

This reverts commit 600f9e7e.

My bad. This was correct.

This reverts commit 46430ceb.
The problem this was suppoed to fix was fixed by letting apk_db_open()
return with same working dir.

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.