fix and restore example of external module

Install more cmake infrastructure to build external modules
from install tree.
Update vtkLocal example to modular VTK mechanics.
Note:
  wrapped modules still have problems

Change-Id: I2a46fc2f3ec32e05c986fa4cc92f3ad35ee7c12a
Merge branch 'update_external_module_example-rel' into release

Change-Id: If6d31f4d31afad729c2611c0959d8962f84980d5