hdf5

[svn-r12522] h5copy was not able to find the source file because it was not using
the $srcdir properly.  It is not right to chdir into testfiles and write
files there because in real srcdir mode, one should not changes things
in the srcdir area which could be shared by multiple builds simultanteously.

Solution: added the proper $srcdir components to the source file name.
Also clean up the indentation by cb.

Tested: only by hand in heping.