vchoi_fork

[svn-r523] Changes since 19980720
----------------------

./test/dtypes.c
	We try to detect whether floating point overflow generates a
	SIGFPE and if it does we don't test overflow cases.

./test/H5Sprivate.h
./test/H5S.c
./test/H5Oattr.c
	Added an H5S_debug() which is called from H5O_attr_debug() and
	which has a switch statement to handle the various data type
	messages.