Delete unused code in pcgen.gui 
* Migrate level exchange chooser from old to new UI.
Issue#: CODE-1825


git-svn-id: svn+ssh://svn.code.sf.net/p/pcgen/code/Trunk/pcgen@18988 ef53c05b-3124-4d59-ae7d-fe3273f42be7
Fix bug: Errors Creating Blackguard
Issue#: CODE-1970


git-svn-id: svn+ssh://svn.code.sf.net/p/pcgen/code/Trunk/pcgen@18989 ef53c05b-3124-4d59-ae7d-fe3273f42be7