Eliminate one reference in the value section of WeakHashMap
Make the other weak.  This should complete making references to outdated PlayerCharacters weak...

Issue#: CODE-2500


git-svn-id: svn+ssh://svn.code.sf.net/p/pcgen/code/Trunk@23209 ef53c05b-3124-4d59-ae7d-fe3273f42be7