adding support of Center-X/Y/Z into VolReader
fixing bug that always returning value > 1 (aka failure) in VolReader
adding support of Center-X/Y/Z into VolWriter
Some optimizations
Some optimizations
adding support of Center-X/Y/Z into LongvolWriter/Reader
fixing bug that always returning value > 1 (aka failure) in LongvolReader
fixing "test failed" in testSliceImageFromFunctor
Changelog
adding test
typo fix
various warning fixes
typo fix
Merge pull request #879 from jlevallois/AddingCenterSupportForVolWriter

Adding support of Center-X/Y/Z for VolReader/Writer
Merge pull request #880 from dcoeurjo/warningFixes

various warning fixes