DATA-982
Minor duplications in ability file repeating in OS

DATA-984
Darkvision ability is not defined in a standard way
Issue#: DATA-982,DATA-984


git-svn-id: svn+ssh://svn.code.sf.net/p/pcgen/code/Trunk/pcgen@19702 ef53c05b-3124-4d59-ae7d-fe3273f42be7