revised binary flags, added a new file to the test generator program to
be used in the binary tests
usage is now
-o F, --output=F Output raw data into file F
-b F, --binary=F Binary output, of form F (into file -o F).
Recommended usage is with --dataset=P
Form F of binary output is: MEMORY for memory type,
FILE for the disk file type, LE or BE for pre-existing
little or big endian types
example
./h5dump -d integer -b MEMORY -o out.bin tbinary.h5
