checkCIF procedure

PLAT305

 This test reports on hydrogen atoms that are not on bonding distance to any
 atom. This ALERT may indicate that the hydrogen atom refined to a  
 non-bonding position or needs a symmetry operation to bring it to bonding  
 distance. It also may indicate a problem with incompatible population  
 parameters (e.g. C - H with population 0.8 and 0.9 respectively).