added ReadAndBuild shortcut in expressreader
renamed IFCVO2X3 to IFCVO
small rearrangements in IFCtoRDFconverter
modified JAVAWriter so that it can handle IFC2X3
start of rearrangements in THING
renaming of IFCX3 to IFCVO
formatted Link class
start of rearrangements in IFC_ClassModel
added JAVA class library for IFC2X3