epm-install: fix filter installed on Debian
epm-check: fix commands
epm: comment out debug messages
fix license description
epm-check: improve for yum
replace pkg_add with pkgsrc (generic name for *BSD package manager)
add short commands epmqi epmcl
add initial support for short output (just package name, without version-release)
epm: add commands
add epm programs command