hdf5_ep

[svn-r10228] Purpose: New way to do conversion test between floating-point numbers.

Description:  The 4th step of change conversion test.  This checkin is only for
conversion between floating-point numbers.

Solution:  The source buffer of floating-point number is filled up in the same
way described in the 3rd step(revision 1.155).

Platforms tested: h5committest and fuss.