Updater version 70.0.0

Added
* Change log that leaves minimal trace of changes updater performed
  stored in system.
* Support for `FilesSignature` field in packages. On mismatch it trigger
  reinstall.
* Support for `files-sha256sum` in packages as hash index

Fixed
* Subprocess call is now terminated way earlier thanks to `SIGCHLD`
  signal handling. This improves update time for any scripts spawning
  "daemon" processes that do not correctly redirect or close standard
  outputs.
* Reinstall of packages if some fields were formated differently in
  index than in package (updater no longer detects change by simple
  string comparison)

Changed
* Internal implementation of base64 replaced with base64c library.
* Utility opkg-create template and input format

Removed
* `--state-log` argument
* `--task-log` argument

Version 69.1.3

Changed
* Error generated from Lua when URI is being finished now includes error
  message from downloader if it was download failure.

Version 69.1.2

Fixed
- Immediate reboot not being performed when combined with replan that actually
  performs some changes in the system

Version 69.1.1

Fixed
* error on transaction recovery created by updater before version 69.0.1
  about `upgraded_packages` being nil

Version 69.1.0

Changed
* Package requests solver no longer tries to maximize number of selected
  requests but rahter follows strictly rules of requests priority
* `Install` requests with same priority as `Unistall` are resolved first
* `Install` and `Unistall` requests without condition as resolved before
  requests with condition given they have same priority specified.

Removed
* Error reported when request to install and unistall same package was
  specified

Version 69.0.1

Fixed
* environment variable `PKG_UPGRADE` were always set to `1` for package
  `postinst` script no matter if it was package upgrade or not.

Changed
* usage of `example.org` replaced with `application-test.turris.cz` in
  tests

Version 69.0.0

Added
* extra argument `pkg_hash_required` for `Repository` command
* support for version limitation of `Install` and `Uninstall` requests
  in package name (such as `foo (>= 1.0.0)`).

Changed
* Execution is now terminated when there is no hash for package being
  installed in repository index unless `pkg_hash_required` is set to
  `false` for that repository.

Removed
* Extra option `version` for `Install` request. You should append
  version specifier to package name the same way as it is done for
  dependencies.

Fixed
* `ROOT_DIR` not being defined for `hook_postinst` and
  `hook_reboot_required` on replan execution.

Fix for possible None return from auto_approve_time

Version 68.0.0

Added
* Queue messages for 'upgrade' and 'downgrade' now also print current
  version in square brackets.

Changed
* Default connection timeout for download was extended from one minute
  to ten minutes.

Removed
* Possibility to reboot immediatelly after package installation. Reboot
  after update is deemed sufficient.

Fixed
* Queue messages now state 'upgrade', 'downgrade' and 'reinstall'
  instead of original generic 'install'.

Version 67.0.3

Changed
* pkgupdate's conf.lua now loads scripts with Full security level
  instead of Local
* libupdater is now versioned with release version (there is no API
  compatibility between versions)

Version 67.0.2

Fixed
* Warning about cycles for packages providing and at the same time
  conflicting with some other package
* Configure script now checks if uthash is available

Version 61.0.1.1

This is release to only fix build because of missing submodule.

Changed
* Lunit submodule now points to new Github repository

Version 67.0.1

Changed
* Package "reinstall" is now performed not only if `Version` field is different
  but also when `Architecture`, `LinkSignature`, `Depends`, `Conflicts` or
  `Provides` are different.
* Information about package changes planned to be performed are now printed with
  wording signaling if that is new package or already installed one and if that is
  update or downgrade or generic reinstall.

Version 67.0

Added
- Warning for packages not verified against repository index because missing hash

Changed
- Custom build system was replaced with autotools
- OpenSSL is now used to verify signatures instead of usign
- URI implementation no longer uses temporally files and passed instead everything
  in memory
- Download retries are removed, code now relies only on libcurl reconnection
- libb64 usage replaced with OpenSSL

Fixed
- Memory leak on archive open error
- Various compilation warning
- Invalid error complaining about path being called on on URI of invalid scheme

Rework packages extraction to not use /tmp

* libarchive is now used to unpack packages instead of tar command
* fix invalid sha256sum field name and that way hash verification
* rm -rf call is replaced with built in function
* call to find replaced with internal function implementation
* update_alternatives.sh script was removed
* empty journal recovery is now not considered as fatal

Fix check for sha256sum on latest version of OpenWrt

Allow requests to be conditioned

* This adds extra argument condition for Install and Uninstall
* Integrated support for Alternatives of packages in transaction

Add Mode command to configuration language

* Added Mode command to control updater's special run modes from
  configuration
* Package scripts now have in environment variable PKG_UPGRADE signaling
  if it is new installation or just upgrade.

Make virtual packages packages without target

* Virtual packages are now packages without candidate and any existing
  candidate for them is ignored (and removed if installed)
* Fix multiple Provices not being applied on appropriate package and
  effectively ignored
* Add URI to some error messages

Fix package block if it provides itself