Eliminate single-usage Ability access method

Issue#: CODE-2465


git-svn-id: svn+ssh://svn.code.sf.net/p/pcgen/code/Trunk@23374 ef53c05b-3124-4d59-ae7d-fe3273f42be7
Test Updates

Issue#: NEWTAG-423


git-svn-id: svn+ssh://svn.code.sf.net/p/pcgen/code/Trunk@23375 ef53c05b-3124-4d59-ae7d-fe3273f42be7