* commit '1a6d4bd7':
  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>