checkCIF procedure

PLAT929

 SHELXL weight parameters are expected to be given in the format below: 
 _refine_ls_weighting_details   
 'calc w=1/[\s^2^(Fo^2^)+(0.1000P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
 JANA style weighting is expected to be given in the format:   
 _refine_ls_weighting_details 'w=1/(\s^2^(I)+0.0016I^2^)'   
  Do not edit this string or make it into a text block between ';'.