Rename ctkDICOM->ctkDICOMQueryRetrieve; ctkDICOMViewer->ctkDICOM

Use ctkDICOM as the name of the top-level application entry
point for all the related functionality.  Rename the previous
ctkDICOM program ctkDICOMQueryRetrieve since it now implements
just a thin wrapper around the corresponding widget.

Applications/ctkDICOMViewer/CMakeLists.txt

@@ -1,4 +1,4 @@
-PROJECT(ctkDICOMViewer)
+PROJECT(ctkDICOM)
 
 #
 # See CTK/CMake/ctkMacroBuildApp.cmake for details
@@ -6,7 +6,7 @@ PROJECT(ctkDICOMViewer)
   
 # Source files
 SET(KIT_SRCS
-  ctkDICOMViewerMain.cpp
+  ctkDICOMMain.cpp
   )
 
 # Headers that should run through moc