patch: varia

[Stefan Seefeld]

The attached patch fixes a number of issues:

* It incorporates the CBE SDK FFT backend into our FFT-handling harness,
  by supporting the --enable-fft=cbe_sdk option.

* It conditionalize more png-dependent examples on the availability of
  libpng, thus preventing errors if the library isn't available.

* It fixes a typo in the tutorial, and adds some support for further
  documentation enhancements (notably the reference manual).

OK to apply to trunk and sdk 2.1 branch ?

Thanks,
		Stefan

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