Update to GAE 1.9.0 / GWT 2.6.0 / JDK 1.7.
Updates for javadoc 1.7.
Fix GWT 2.6 regression wrt 'enter' behavior in call entry box.

See http://code.google.com/p/google-web-toolkit/issues/detail?id=5003
sdrweb: Don't require second click when selection call from suggestions list.
Update Appengine version to "4".