updated BigInteger to BigDecimal for precision/scale example
updated TODOs
accidentally merged with jpa-class branch and had to repair several files to restore javaee site
corrected index page
Merge branch 'jpa-working' into working to get JPA Query Exercises

Conflicts with src/site/xdoc/index.xml were resolved by taking
version from working after merging with master and updating.
Merge branch 'jpa-working' into working
merged with jpa-class
removed erroneous version spec
Merge branch 'jpa-working' into working
merged with jpa-working to get syllabus text change
added validation api
Merge branch 'jpa-working' into working
added explicit name for link table
added shell of jpa-tuning
adding sql tuning content
added non-null index sort
added function index
added guidelines
added semi-join
started mapping/running against imdb