checkCIF procedure

PLAT927

 Please check whether the wR2 value that is reported in the CIF corresponds 
 with the wR2 value calculated from the parameters supplied in the CIF. See at 
 the end of Section #10 in the '.ckf' report file for details.  This test is
 based on the observed reflection data in the FCF and reflection data that are
 calculated with the parameters (i.e. coordinates, displacement and weight
 parameters) taken from the CIF.