Remove code referencing unexisting variable. See #449
Remove 'CTK_WRAP_PYTHONQT_FULL' obsolete option. See #449

* Since PythonQtGenerator was only used for Python FULL wrapping, remove
the corresponding external project.

* Remove reference to Full wrapping

* Update ctkMacroWrapPythonQt to complain if existing code invoke
the macro with 'IS_WRAP_FULL' set to TRUE
Remove setting of INCLUDE_DIRS variable specific to PythonQtGenerator

See #449
Move all PythonQt wrapping code into one script. See #449
Optimize ctkMacroWrapPythonQt creating required source list in a single loop.

See #449
Configure module init file at configure times. See #449
Simplify how path of generated file are specified. See #449
Simplify moc'ing of generated PythonQt wrapper. See #449
Remove Light wrapping CMake script and directly invoke python executable

See #449

System integrating CTK will be responsible to ensure the proper
environment is set to execute the python interpreter.
Do not log PythonQt wrapping output. See #449

If a user which to debug a particular issue, setting the verbose
variable should be sufficient.
Optimize QT4_GENERATE_MOCS macro getting moc flags only when needed

See #449
Simplify QT4_GENERATE_MOCS. See #449
Re-create python compile script only if needed and fix dependency. See #449
Fix python script compilation removing inputs from custom target deps. See #449
Merge branch '449-speedup-cmake-config-and-generation'

* 449-speedup-cmake-config-and-generation:
  Fix python script compilation removing inputs from custom target deps. See #449
  Re-create python compile script only if needed and fix dependency. See #449
  Simplify QT4_GENERATE_MOCS. See #449
  Optimize QT4_GENERATE_MOCS macro getting moc flags only when needed
  Do not log PythonQt wrapping output. See #449
  Remove Light wrapping CMake script and directly invoke python executable
  Simplify moc'ing of generated PythonQt wrapper. See #449
  Simplify how path of generated file are specified. See #449
  Configure module init file at configure times. See #449
  Optimize ctkMacroWrapPythonQt creating required source list in a single loop.
  Move all PythonQt wrapping code into one script. See #449
  Remove setting of INCLUDE_DIRS variable specific to PythonQtGenerator
  Remove 'CTK_WRAP_PYTHONQT_FULL' obsolete option. See #449
  Remove code referencing unexisting variable. See #449