Split the "save smtk model" operator in two.

This splits a portion of the functionality in "save smtk model" into a new "export smtk model" operator.

Also, this removes some dead code (a "package smtk model" operator that does what "export smtk model" now does).

smtk/extension/paraview/operators/CMakeLists.txt

@@ -5,16 +5,20 @@ include(ParaViewPlugins)
 set(srcs
   smtkAssignColorsView.cxx
   smtkSaveModelView.cxx
+  smtkExportModelView.cxx
 )
 
 set(hdrs
   smtkAssignColorsView.h
+  smtkModelIOView.h
   smtkSaveModelView.h
+  smtkExportModelView.h
 )
 
 set(qtui
   smtkAssignColorsParameters.ui
   smtkSaveModelParameters.ui
+  smtkExportModelParameters.ui
 )
 
 #install the headers