Improved interface of Value class hierarchy
Made classes Name, PropVal, PropKey and PropPath final
Added override and final specifiers to methods of HasValue classes
Added override specifier to LoggingFacility methods
Added override and final specifiers to main Bric classes

Also removed unimplemented	Bric::connectInputsRecursive() and relic
Bric::canHaveDynBrics().
Added override and final specifiers to MRBric
Added override and final specifiers to other Bric classes