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Only show a warning if we have a non-existing repository or bad
repository signature but don't abort.

This is not to break compat with behaviour in previous releases.

The 'r' variable is overwritten and no longer holds the repository
number.

Also clean up handling of signature failures for index files.

 * upgrade needs explicit check so we don't try self-upgrade
   (which would print additional messages on screen)
 * add can fix problems, so check against the new world
 * merge the code in few places

 * default writing the world with spaces if a space is found
   (for backwards compatibility) for now

call apk_pkg_install() and hlist_tail_ptr() only once. the latter
is O(n) and can get very slow.

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

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.

fixes #738

still todo:
  - 'fix' is missing
  - 'del -R' does not work
  - 'upgrade' does not do self-upgrade first

... and a lot of testing.

Make indexer keep noise about errors that prevent index generation.
Detect certain errors in the APKs better. And also have the applet
return error in these scenarios.

remount to read-write before trying to create the cache directory
subdirs. fix a fd leak that might prevent remounting back to rw.

The apk cache might be on the readonly media so we need wait with
remounting til after atleast this filehandle is closed.

This is so we can do x86 --root installs on x86_64 hosts.

Using --arch without --root can make great damage so we only enable it
if --root is used.

move all files therein to other places. this allows /var to be
mounted from harddisk, but rest of system be run from ramdisk.

this also removes support for historical version of the scripts
database which was obsoleted in 2.0_pre16 (in July 2009).

in accordance with FSH. this also to clear /var of apk related things
as we might want to run /var as harddisk, but rest of system from
ramdisk.

comment out the code that was out for testing. duh.

.. and back to read-only after finishing with modifications.

fixes #512

if package arch is not set, do not append anything to repository.
if arch is set, it is appended to repository.

Use statfs() filesystem type, instead of the device IDs.

Packages without architecture should get the platforms default
architecture (so we are backwards compatible). Only the virtual
packages should get 'noarch' by default. Also print full path
to the index file which failed.

The atomization change broke virtual packages because they don't
have license or arch set.

Parse install_if from package metadata and include it in the
indexes. Also setup the reverse install_if dependencies when
loading a database. ref #443.

Actual install_if functionality is not yet implemented.

Just disable installation of packages using the new stuff. Also
flag lower case package info fields as non-critical and allow
installation even if that features is not supported.

 - implement a hash table for commonly shared fields such as
   license, version and architecture
 - use macroes to print blobs or pkgname-pkgver strings
 - fix some old cruft