ENH: Update IntensitySegmenter from r12 to r13

BUG: include(ExternalData) was missing.

Project was not configuring with CMake 2.8*, but only with CMake 3. Inclusion of CTest and ExternalData has been moved to main CMakeLists (not superbuild) to be able to run the tests from the main folder.

http://www.nitrc.org/plugins/scmsvn/viewcvs.php?view=rev&root=dentaltools&revision=13
Merge pull request #797 from fbudin69500/update-IntensitySegmenter

ENH: Update IntensitySegmenter from r12 to r13
Updating IASEM extension

This update add the IASEM Series Import module.
Merge pull request #799 from blowekamp/update-IASEM

Updating IASEM extension
ENH: Update ModelToModelDistance from revision c418cf6b1435d2fb2add9bc6b66920d9cbcb074d to b14ee82a7a9b54f15ee668909141691409a4db7e

https://www.github.com/NIRALUser/3DMetricTools/compare/c418cf6b1435d2fb2add9bc6b66920d9cbcb074d%E2%80%A6b14ee82a7a9b54f15ee668909141691409a4db7e
Merge pull request #800 from fbudin69500/update-ModelToModelDistance

ENH: Update ModelToModelDistance from revision c418cf6b1435d2fb2add9bc6b...
ENH: Update ModelToModelDistance from revision b14ee82a7a9b54f15ee668909141691409a4db7e to 9c35ae2f336652b2ebf8b139d8e8fb5de30fc8aa

https://www.github.com/NIRALUser/3DMetricTools/compare/b14ee82a7a9b54f15ee668909141691409a4db7e%E2%80%A69c35ae2f336652b2ebf8b139d8e8fb5de30fc8aa
Merge pull request #801 from fbudin69500/update-ModelToModelDistance

ENH: Update ModelToModelDistance from revision b14ee82a7a9b54f15ee668909...
Update IASEM extension

This update addressed the std::sort build failure due to missing
header.
Merge pull request #802 from blowekamp/update-IASEM

Update IASEM extension
Updating IASEM fixing unused variable warnings
Merge pull request #803 from blowekamp/update-IASEM

Updating IASEM fixing unused variable warnings
update PETDICOMExtension

* use non-private codes for encoding RWV quantities
Merge pull request #807 from fedorov/update-PETDICOM

update PETDICOMExtension
update PETDICOM

Fix compile error
Merge pull request #809 from fedorov/update-PETDICOM

update PETDICOM
update TCIABrowser

fix logo
Merge pull request #811 from fedorov/update-TCIABrowser

update TCIABrowser
update NeedleFinder to be compatible with new VTK version
Merge pull request #826 from gpernelle/update-NeedleFinder-master

update NeedleFinder to be compatible with new VTK version