ADD: set and get space and time units from and to NIfTI files
CHG: write slice_duration in seconds to please AFNI / retroicor


git-svn-id: https://www.nitrc.org/svn/cmtk/trunk@5254 42a5c34f-2066-0410-bec5-ba365beb4995
CHG: new baseline NIfTIs with space/time units set

git-svn-id: https://www.nitrc.org/svn/cmtk/trunk@5255 42a5c34f-2066-0410-bec5-ba365beb4995