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ENH: Speedup by 50% handling of argument expected to display a msg and exit

Sam Horvath requested to merge github/fork/jcfr/speedup-command-display-and-exit into master

Created by: jcfr

On my workstation, executing "Slicer --help" or "Slicer --version" went down from ~1.3s to ~0.6s.

This commit introduces the function quickExit allowing to quickly terminate the executable.

After supporting exclusively c++11, the corresponding function from the standard library will be used. See http://en.cppreference.com/w/cpp/utility/program/quick_exit

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