usage information not generated by an error should go to stdout, not stderr.  Also: streamlined usage info, and added at the end a summary of the available formats and encodings, like what nrrdSanity provides
usage information not generated by an error should go to stdout, not stderr.  Also: streamlined usage info, and added at the end a summary of the available formats and encodings, like what nrrdSanity provides

git-svn-id: 9e9401559e51101c165cdce4d49b411eb20436ed@3998 3d70eeeb-363e-0410-a505-8a46323a89f2

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