CLEREZZA-881: reduces the time between the system graph being availabe and it containing all the data (not a fix, but should reduce symptoms)
CLEREZZA-881:providing a TcProvider for the system garph to make sure it is only available when fully loaded
CLEREZZA-717: added constants for SKOS04 while keeping the SKOS pointing to SKOS08, as requested by Tsuy and suggestest by Rupert. In future versions SKOS04 shall become SKOS and undeprecated, SKOS04 will then remain there a while as alias for SKOS. So if you can use SKOS04, if you have to use SKOS08. For now avoid using SKOS.