[html-formfu] [patch] Change eval tests to use ref for big speed up in _Group.pm

[Steve Nolte]

I noticed a big slow down when dealing with group-type fields that have a lot of options.  Tracked it down to the H::FF::E::_Group _parse_option() which was using eval's for testing if the item was a hash or array reference.  Switched it to just test with ref() and got a major speed up, about 1.5 to 2 seconds for some forms.

(BTW This is my first patch to a mailing list... hope it works!) 

-Steve
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