Switches reusable resources back on
EOS/CTA Protobuf no longer has uid and gid fields
Adds pid and tid to log messages
Disables reusable resources
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
Integrates XRootD logging
Includes test client/server
Initial version