erc: improve print supported formats
erc: add exe archives support (hack)

ercat: add check for unpack binary and epm assure
ercat: add .zst (.zstd) support

add support for pack to zip if one dir arg was received

allow get type of archive for nonexists files too

ercat: add lz4 support

skip repack for the same input and output file
erc: add add command
erc: add tgz format recognize
pack unerc

erc: add -f (--force) for override target, improve test

add zpaq and pax to supported formats
erc: add options support and implement --quiet
add unerc command

improve is_target_format to check against supported target formats

erc-archive: fix basename issues
use bash for all scripts (welcome to debug with dash!)

ercat: add support for plain text files too
update README, add man pages

small fixes
erc: enable search and improve help

erc: unpack archive by default
erc: add support for target arch to create and repack
introduce ercat: cat any archive to stdout (like bzcat)

initial build for ALT Linux Sisyphus