- nrrdAccessors.h has been removed.  No one ever needed prototypes for all those functions.
- nrrdAccessors.h has been removed.  No one ever needed prototypes for
all those functions.

- new source files convert.c (for all the functions used in
nrrdConvert()) and arith.c (place for all functions which will do
arithmetic on nrrds)


git-svn-id: 9e9401559e51101c165cdce4d49b411eb20436ed@202 3d70eeeb-363e-0410-a505-8a46323a89f2

Slicer/teem,Slicer/teem,BRAINSia/teem,Slicer/teem,BRAINSia/teem,BRAINSia/teem,BRAINSia/teem,Slicer/teem,BRAINSia/teem,Slicer/teem