Fix itk2vol (issue #390)

[kerautret]

PR Description

Fix issue of compilation (issue #390) and cmake use (this fix all ITK read/write that was failing).
(for travis check, first merging [PR #394 ]

Checklist

• Doxygen documentation of the code completed (classes, methods, types, members...).
• Main tool doxygen documentation (following existing documentation of DGtalTools documentation.
• Check if it follows the tools structure described in CONTRIBUTING.md
• New entry in the ChangeLog.md added.
• Update the readme with potentially a screenshot of the tools if it applies.
• No warning raised in Debug cmake mode (otherwise, Travis C.I. will fail).

[phcerdan]

Looks good to me, the travis-ci error seems unrelated.

[kerautret]

Looks good to me, the travis-ci error seems unrelated.

Thanks, yes trying to reload (now a timeout appears 😱