* commit '1a6d4bd7b60761bd7d955011ce7df4dd6b87b497':
FATE: add a test for the fade filter
FATE: add a test for the drawbox filter
FATE: add a test for the boxblur filter
FATE: add a test for the gradfun filter
Conflicts:
tests/fate/filter.mak
tests/ref/fate/filter-gradfun
our gradfun test is renamed to gradfun-ubitux as its name conflicts and
it was requested to be kept. Feel free to rename, change, finetune ...
Merged-by: Michael Niedermayer <michaelni@gmx.at>