Handle empty array initialization in numpy_support.

Change-Id: I050a9cfc1979856a4663ac5c0e3b4aa3ae57b255
Upgrading the Tcl examples wrt. VTK 6.x

Most of them needed invoking the method 'Start' over the object
'iren'. Other examples needed upgrading the code following the
directions given at http://www.vtk.org/Wiki/VTK/VTK_6_Migration_Guide

Change-Id: If092043a7a9ecda1ccea941281775bff28623d56
Merge topic 'empty-array-init' into master

90d75926 Handle empty array initialization in numpy_support.
Introduce box plot and the corresponding chart.

Change-Id: Ic5c728d45d447fac2678401394717d261dd91d48
Merge topic 'IntroduceBoxPlots' into master

999ed2a6 Introduce box plot and the corresponding chart.
Merge topic 'FIX_TCL_EXAMPLES_WRT_VTK6.XX' into master

6653cd05 Upgrading the Tcl examples wrt. VTK 6.x