hdf5_der

[svn-r22961] After discussing with Elena, we agreed there should be a distinction
between supported platforms (aka contract obligation) and Tested platforms
which are machines not paid for but we think it benefits us for doing
testing on them.

So, I divided up the previous "Platforms Tested" list into
"Supported Platforms" and "More Tested Platforms".
The feature summary shows only supported platforms.


Let me know if I have made any mistakes.