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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.

Support version numbers specified with packages. For example:

 apk add 'busybox<1.14'
 apk add 'squid=>3.0'

since we dont verify the checksum we dont need to calculate it
Speed up when you try fetch lots of stuff thats already there.

We need to close the fd on destruction. This is what the corresponding
istream variant does too.

According the manpage readlink(2) does not append a null byte to buf.
So we have to do it ourselves.

Otherwise the iso image will have softlinks which is not what we want

leftovers from a debug session.

fixes #42

This will also fix a bug that left an empty file in destination dir when
source file did not exist in repository.

There are still issues with paths longer than 255 chars.

So we don't get local modifications or extra files in the tarball.

we should always close the in-stream, not only on failure.

This reverts commit 0906a1c7.

Conflicts:

	src/add.c

saves space

We upgrade when we have an oldpkg.

By locking all the given dependendencies for virtual packages first
we can catch invalid deps and report those. This is alot more helpful
than just reporting "Unable to install <virutalpkg>"

implements 'apk add --virutal metaname dep1 dep2...' where metaname will
be an empy meta package with dep1 and dep2 as dependencies.

This is useful to prevent abuild to add each makedepend to world which
causes some headache when it comes to unintalling them after sucessful build.

The syntax is: apk index -d /path/to/APK_INDEX.gz pkg...

It does not seem like its possible to remove packages in the db so we
trick apk_db_index_write() by setting the repo to on-zero.

It's still not perfect since it does not recalculate the dependencies.

The compiler is actually right about those.

The state size is taken from name_id and cannot be extended. So we
must wait with initializing the state til we have all packages added
to the db.

We must also always allocate the package name, incase its not in the
repository. This is done with apk_db_get_name().

A = "added"
U = "updated"

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.

This should be slightly faster and comsume less memory in theory