[wip] /sampledna command now functions. HAM is charged but no xp or
item is given yet. all range and rule checks should now be in place.
still todo: success/fail against dna_harvest skill. combat change
chance i.e. dead/attack/nothing. number of samples by skill range and
finally generate a dna sample obejct.

Change-Id: I2ed5f0fc6cfc72aeb2f6ebbcebd4282f8c7d7a50