pixelpipe: added filter annotation to disable plugins on export
denoise: add buttons and stubs of background jobs.
denoise: write out seed images halfway through the pipe as pfm.
denoise: two new files to encapsulate the denoising code.
denoise: some support code.
denoise: compile fixes (tmp)
denoise: this works, is slow and somewhat underwhelming.
denoise: added edge buffers + blurring (buggy)
denoise: add downsized prior accumulation.
superres: initial plugin stub.
superres: upsize using almost naive upsampling first.
superres: added rough outline of the algo.
superres: some debugging work.
superres: a few bugfixes. still sucks.
Merge branch 'master' into superres

Conflicts:
	src/control/jobs/control_jobs.h
denoise: bilateral with better sigma estimates.
noise profile support code.
imageio: one step ahead supporting non-bayer dng (still doesn't work though)
noise profiling: more tools.
noise profile: some histogram flattening.