Moved unnecessary TSS-specific constants to TSSHandler.java.
command "editingTreeWindow" uses stored trees, which is what we want.
updated build.xml
Merge branch 'TSS_handler' of https://github.com/daisieh/nexml.java into daisieh-TSS_handler

Conflicts:
	src/mesquite/nexml/InterpretNEXML/AnnotationHandlers/TSSHandler.java