fftw-3-single

[Takeshi Enomoto]

>> Ok, let's install both double and float versions as default.
>
>> <http://trac.macosforge.org/projects/macports/ticket/11613>
>
> Looks good.

Thank you for examining my submission.

Should we
- let fftw-3 succeed both double and float versions or
- create a new fftw3 package?

In either cases,
- we could clean all portfiles depend on fftw-3 or fft-3-single
   and replace them with fftw-3 (new) or fftw3 or
- we could leave them as it is and wait until the completion of
   transitions of all packages.

I am in favour of naming it fftw3 and replace all the dependent
at once portfiles in some occasion.
It would be quicker if someone has commit permission did the  
replacement.

Takeshi