Bug #484730: In sync mode, use repos.conf section name when repo_name file is missing.
Flag  -Waggressive-loop-optimizations warnings.
This will fix bug #484840.
_copyxattr: ignore EOPNOTSUPP from xattr.list()
_copyxattr: ignore EOPNOTSUPP from os.listxattr()

This will fix bug #484540.
emerge-webrsync: fix bug #484950
RepoConfig: fix bug #485006