Cleanup README.md

- epm-check: use rpmevrcmp to delete old versions
- epm-sh-functions: improve systemd detection (docker support)
- support release upgrade for p9

- add trueconf-client repack config
- epm: set timeout for 2 secs
- fix broken pkg_filenames

- epm downgrade: add --auto support
- add repack scripts for chromium-gost and google-chrome

- check: improve remove dupls: remove identical packages, add common removing

- check: add fix duplicates
- epm: keep sssd-ad during upgrade

- add Amzn (Amazon Linux AMI) support
- rename README to README.md
- fix openSUSE Leap support
- epm-release_upgrade: force install make-initrd if exists when upgrade to Sisyphus

- distr_info -b: add 64 bit for aarch64
- epm-print: fix release output, add version-release support
- add yandex-browser-beta.sh
- add --short support for what-depends

- distr_info: add OpenWrt detection
- distr_info: drop obsoleted systems
- fix inputistty (implement via test -t)
- distr_info: use awk instead tr (broken in busybox on OpenWrt), cleanup code