checkCIF procedure

PLAT093

 The 'mixed' type Hydrogen atom refinement is reported (SHELXL-97 default). 
 However, no Hydrogen atoms with freely refined positions are found in the  
 CIF. Likely, the value 'constr' or 'refU' for  
 '_refine_ls_hydrogen_treatment' will be more appropriate (e.g. when all
 Hydrogen atoms have been refined in the riding mode on their carrier atom).