checkCIF procedure

PLAT698

 The supplied CIF contains a '_shelx_include_file' record but not a valid   
 associated '_shelx_include_file_checksum' record or valid value..  
 This include file is called from .ins and is needed for the refinement  
 and re-creation of the associated .fcf file (used for a detailed analysis of   
 the refinement result). The calculated and reported checksums should be
 identical. Only characters with an ASCII value higher than 32 contribute to
 the checksum.  An embedded include file might be broken, either due to 
 transfer errors or to deliberate or accidental post-refinement editing of its   
 content.