This function should be used to create a new user defined function symbol.
pSymbolUF _new_SymbolUF(peXobject pEx
A user function is defined by its serial number (serial number is actually not used in the current sytsem) and by the node number where the function actually starts.
The number of arguments and the number of local variables are defined in the generated command and not in the symbol table. This way these numbers are available as they should be during run time.