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printf %i does not work so well with size_t on 64 bit.
Use %zu which seems to be portable enough.

And add some more verbosity to the help message.

and re-arrange the order of displayed info

By using a bitmask we can combine subactions

apk --help will list the generic options only and give a list of commands
To get the details for a spefic command, 'apk command --help' should be used.

This allows you to query the state db even if you do not have write
permissions in cache dir (which is needed if you have remote repositories)

This should speed up things and save some memory if you have big and slow
remote repositories.

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.

- empty lines comes after not before
- separate pkgname with : when using -v option

Add flags field to db open call. Also make error reporting quite a bit
more detailed.

also introduce apk_verbosity. --quiet reduce verbosity and --verbose
increases it.

Default verbosity is 1.

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

so far it only lists installed packages