ResumeSupported is a Boolean function used as the read access specifier for the
CanResume property, and indicates if the FTP server implements the FTP REST command. ResumeSupported calls the
Quote method using the FTP command literal 'REST 1' to determine if the capability is supported in the FTP server implementation, and calls
Quote using the command 'REST 0' to disable the test. When ResumeSupported returns True, the FTP server allows restart markers for file transfer.
ResumeSupported is examined in Get to determine if the FTP REST command is needed to resume file retreival at a specified restart marker.