hdf5_der

[svn-r27693] HDFFV-0: bug fix
Problem: the script tried to launch the test command as "a.out" but not all userss
would have "." included in their $PATH for safety concerns.
Solution: Changed the mere "a.out" to "./a.out" so that the script knows how to launch
the test program.

Tested: AIX Ada (where I don't have '.' in my $PATH)