Add a new example to generate fake PET (2D series)
Minor code cleanup
Fix an issue with generation of PET Image Storage Series

As reported on the ML by Nick Patterson
Merge branch 'release'
Add Enhanced PET Image Storage
set GDCM_VTK_DIR to VTK_DIR which is exported into *.cmake files
Merge branch 'release'
introduce new variable GDCM_SKIP_USE_VTK

When set to true, it skips all parts which makes a cmake dependency to VTK
(when GDCM is built with GDCM_USE_VTK turned ON). Note by default this variable
is not set (which is equivalent to set to false).

Here is an example of usage:

  set( GDCM_SKIP_USE_VTK ON )

  find_package( GDCM REQUIRED )
  include( ${GDCM_USE_FILE} )
Merge branch 'release'
Add jpf extension support

Thanks to Nicolas Roduit (Nicolas.Roduit jmicrovision.com) for report
Merge branch 'release'
Fix compilation with Visual Studio 2013

The <algorithm> header is required to define std::min/std::max
Fix compilation error in SWIG 3.x
Merge branch 'release'
Fix monochrome inversions not respecting the Pixel Format of the image.

The pixel format of the image is being ignored  in the monochrome
conversions causing bad conversions for images that are not 8bpp.