Renamed CTA/tapeserver/castor to CTA/tapeserver/castor_checkout in preparation for the moving the sub-directory CTA/tapeserver/castor/castor up the directory tree

    castor::utils::SmartFd

This class should eventually replace the folowing class:

    castor::tape::utils::SmartFd

Dennis used within ithe LoggerImplementation class with C++ std::ostringstream
code.

The castor::log::Param class simply contains an std::string name and an
std::string value.  The new templated constructor of the Param class uses
std::ostringstream to convert a non-string value to a string one.

identified ares of the new logging code that should be removed.  I will
remove them in a future commit so that we can come back to this one if we
decide the removals were too much.