Added VO OptionString to cta_admin.proto
Adds summary header message to "cta-admin af ls -S" response
Removes vid field from ArchiveFileItem No impact on EOS, this message is used by cta-admin only
Updates cta-admin protobufs to allow more types of streaming data
EOS/CTA Protobuf no longer has uid and gid fields
Supports setting configuration options by config file, environment variables or explicitly in the code
Implements log levels (requires XRootD >= 4.8.2)
Logs Protobuf Request/Response inside Send() method