[jdt-ui-dev] structure selection actions are enabled now

["adam kiezun" <adam.kiezun@xxxxxxx>]

description was posted to this list before (it can also be found in the
build notes)

limitations:
1.
because of a strange bug http://dev.eclipse.org/bugs/show_bug.cgi?id=5076
(the same that will not let you extract method from TestRunner)
the behavior can sometimes be sub-optimal (selects too much)

2. perfomance could be improved (depends on AST creation performance)
a.