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caused upgrading package X with "apk add path/to/x...apk" where
the package file was not in any repository to not work properly.

broken in commit bfd53b59 (print: minor cleanup to indented writer).

Improves /etc/apk/repositories format so you can say:
http://nl.alpinelinux.org/alpine/v2.3/main
@edge http://nl.alpinelinux.org/alpine/edge/main
@testing http://nl.alpinelinux.org/alpine/edge/testing

After which you can pin dependencies to these tags using:
 apk add stableapp newapp@edge bleedingapp@testing

Apk will now by default only use the untagged repositories,
but adding a tag to specific dependency:
 1. will prefer that tag for the name
 2. allowing pulling in dependencies from that tag (though,
    it prefers untagged packages to satisfy deps if possible)

fixes #575

One can now say in dependency "!foo<2" which means, that if foo is
installed, it needs to be >=2, but it's not a required dependency.

Use new apk_blob_pull_dep instead of the old apk_dep_from_blob

If two packages replace each other, the one with highes priority
will keep the file. Additionally, if we have a package overriding
another's file it's remembered and handled properly. This is
essentially to allow "policy packages" which just overwrite certain
(configuration) files from other package(s).

"replaces" is now turned to a full dependency type list, so you can
make package overwrite files only certain versions of the package
(though, we should probably take this into account already at solution
calculation phase).

Also make 'info --replaces' print the "replaces" of the package.

This is in preparation for the policy package support, which still
requires "replacement priority" field to decide which packages' files
get the preference.

Should now choose packages better if the best available version
is uninstallable for some reason.

this prunes the search tree considerably and fixes a speed
regression introduced in an earlier commit.

the solver requires this.

We need to refresh all name states after backtracking as options
that were excluding due to topology ordering might have become
available.

The array struct aligned size to 64 bit on x86_64 which caused bad things
to happen.

We use size_t to make sure the size element is correct regardless arch.

Solution found by Timo.

allow per-name solver flags to be inheritable, and use them in
self-upgrade, add -u  and the fix applet. this gives more familiar
behaviour for the upgrades.

Tests whether given package string is installed

- call apk_atom_init()
- if no open flag is specified, then default to read-only.

so far we just parse the db options

namely this fixes apk upgrade without --no-self-upgrade when
the solver is called twice.

Use the build option SHARED_LIBAPK for building shared.

So we can build with -Werror

the only bit of information needed in solver commit is the "hard"
topology sorting information for trigger ordering. fixes a bug in
"apk del" which uses the state pointers to do intermediate
calculations between solution solving and commit.

also optimize search to happen for enumeration of package names.
fixes #39, fixes #560

fixes #714

fixes #738

Use it to avoid self-upgrade loops in case something fails during
the initial upgrade attempt.

Make a loud warning if the script returns failure, but do not
abort installation sequence because of that.