Update cfitisio download link

[GabrielMissael]

Hello!

I'm trying to install the WMAP wrapper, and when running ./waf configure --install_all_deps, pups up the following error message:

Checking for library ['cfitsio']                                           : not found
cfitsio not found
check that cfitsio_prefix or cfitsio_lib and cfitsio_include command line options point toward your cfitsio install
or check that cfitsio is compiled in 64 bit
cfitsio not found, try to install it
Install 'cfitsio3280.tar.gz'
download from ftp://heasarc.gsfc.nasa.gov/software/fitsio/c/cfitsio3280.tar.gz
curl ftp://heasarc.gsfc.nasa.gov/software/fitsio/c/cfitsio3280.tar.gz build/cfitsio3280.tar.gz
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
curl: (67) Access denied: 550

Looking in the web, I found that this link actually works and corresponds to the same cfitsio version: https://heasarc.gsfc.nasa.gov/FTP/software/fitsio/c/cfitsio3280.tar.gz

[GabrielMissael]

If this is only a machine-particular error, please reject this pull request.

I also created an issue, but I can´t link the PR to it, but here it is: https://github.com/brinckmann/montepython_public/issues/278

[brinckmann]

Thank you, this is included in the upcoming v3.6.

Best, Thejs