fft_eval: fix build warnings and link errors

Fix Ubuntu 12.04 warnings, errors.

Signed-off-by: Janusz Dziedzic <janusz.dziedzic@tieto.com>
fft_eval: add keys 2 and 5 handling

Add key_2 and key_5 handling. Will set
screen for 2GHz and 5GHz directly.

Signed-off-by: Janusz Dziedzic <janusz.dziedzic@tieto.com>
fft_eval: print used file name in title window

Print file name in title window.
Usefull in case of spectrum comparation.

Signed-off-by: Janusz Dziedzic <janusz.dziedzic@tieto.com>
fft_eval: add scan script

Add scan script scan.sh

Signed-off-by: Janusz Dziedzic <janusz.dziedzic@tieto.com>