patch: enhancements for freqswap()

[Stefan Seefeld]

The attached patch reimplements vsip::freqswap(), yielding two important 
changes:

* The recently discovered restriction that the input Block type must be 
allocatable is removed.

* It uses a return-block optimization, allowing it avoid a temporary 
view by using expression template techniques.

Note that the algorithm itself was slightly enhanced to allow to operate 
on a block in-place, therefor removing the constraint that input and 
output must not alias.

OK to commit ?

Thanks,
		Stefan

-- 
Stefan Seefeld
CodeSourcery
stefan at codesourcery.com
(650) 331-3385 x718
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