* gegl/gegl-operation.[ch]: replaced calc_source_regions with
compute_input_request, renamed get_affected compute_affected. As well
as the needed refactoring to make processing work with this new, less
coupled version of the roi geometry computation.
* gegl/gegl-node.c: (source_invalidated): get_affected->compute_affected.
* gegl/gegl-operation-area-filter.c: Adapted to new API.
* gegl/gegl-operation-composer.c: ...
* gegl/gegl-operation-filter.c:
* gegl/gegl-operation-sink.c:
* gegl/gegl-operation-source.c:
* operations/affine/affine.c: Adapted to new API.
* operations/blur/box-blur.c: ...
* operations/blur/gaussian-blur.c:
* operations/color/remap.c:
* operations/color/stretch-contrast.c:
* operations/core/crop.c:
* operations/core/shift.c:
* operations/workshop/*.c:

svn path=/trunk/; revision=1508