epm: check real file detection
implement info and use it
checkpkg: use assure for erc
rewrite assure_exists with internal __epm_assure
simulate: add missed --dry-run for zypper
epm-check_updated: fix if perms is unsufficient
fix messages
info: if stderr is forwarded, write to stderr
new build 1.5.1-alt1 (with rpmlog script)