Applying Sprik constraint method to the coordination number

[Sal]

Dear CP at K users,
I'd appreciate if you can help me to set up constraint to the coordination 
number of a specific atom.
I know there is COLVAR defined for coordination number, but I don't want to 
do free energy and metadynamics with DO_HILLS,....
My aim is to prevent bonding of H atoms to a negatively charged particle.
This can be done in CPMD  using "COORSP" 
(http://cpmd.org/downloadable-files/no-authentication/manual_v4_0_1.pdf)

Thanks,
Sal
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