checkCIF procedure

PLAT606

 This test reports on a solvent accessible void in the structure that are too
 large or too time consuming to calculate for the current PLATON version for
 a more detailed analysis as part of the validation run. Use the PLATON/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.