added default constructors for Attribute and Table
started playing with transitions
partial work on Insertion
update parser
 - strip table and attribute names from quotes
add method to update table value for each attribute
initial working on transition to xml
design update for transitions
 - methods are now implemented in abstract class Transition
 - add Update class
 - rework with JAXB (more detail)
 - add unmarshal in Testing
minor bug fix
ANTLR auto generation change
 - move generated files to package  parser
 - change file paths to relative
change package name
new datasets
fix minor XML related bug
minor fixes
 - parser fixes
 - use new swing theme (Nimbus) if available
ANTLR no longer rebuilds after grammar change
gui updates

 - update email in AboutDialog
 - update file and folder dialogs to remember last file and dir
update parser
minor gui update
update gui

expanding items on one tree now expands the maching item on
the other tree
opening folder exports transitions.xml on working directory