Finish case folding for greek block U0370-U03FF.

This is meant to capture all variants of common greek characters.
Use "find" to allow user to locate vtk.jar.
Try building Java test without vtkTestingJava.

The vtkTestingJava class only seems to be available if VTK was built
with testing.  There is no easy way for our cmake file to test if VTK
was built with testing, so simply remove vtkTestingJava for now.
Sometimes vtk.jar is installed as vtk6.jar.
Run test with python if vtkpython not found.
Raise cmake error if java build doesn't find vtk.jar.
Do not install vtkDICOMBuild.h.
Add beginnings of a Query method for data sets.

Given an object that describes a query, this will return the result
of that query.
Change vtkDICOMDirectory to return arrays rather than ranges.

This provides more flexibility in how studies can be ordered.  In particular,
sorting studies by date can be more useful than sorting by patient in some
circumstances.
Add very crude query code to vtkDICOMDirectory.

This simply allows the results to be filtered, based on whether they
match the given query.
Add a dicomfind program (still under development).