checkCIF procedure

PLAT606

 This test reports on a solvent accessible void in the structure, too large 
 or too time consuming for the current PLATON version for a more detailed   
 analysis as part of the validation run. Use the SOLV option for more details.  
 Such a warning might also indicate that the symmetry is incomplete 
 e.g. should have been specified as P-1 and not P1, leaving out half of 
 the unit cell content.