Update readme for 6.1.8

git-svn-id: svn+ssh://svn.code.sf.net/p/pcgen/code/Trunk@21961 ef53c05b-3124-4d59-ae7d-fe3273f42be7
Adapt to new file tree layout standards

git-svn-id: svn+ssh://svn.code.sf.net/p/pcgen/code/Trunk@21962 ef53c05b-3124-4d59-ae7d-fe3273f42be7
Adapt to new file tree layout standards

git-svn-id: svn+ssh://svn.code.sf.net/p/pcgen/code/Trunk@21963 ef53c05b-3124-4d59-ae7d-fe3273f42be7
Adapt to new file tree layout standards

git-svn-id: svn+ssh://svn.code.sf.net/p/pcgen/code/Trunk@21964 ef53c05b-3124-4d59-ae7d-fe3273f42be7