Blender Git Loki

Error reported by Daniel Salazar, Compositor color is wrong since my fix.
this is because of fairly confusing logic, when an SRGB image has a float buffer added its always LINEAR, so we have to account for this elsewhere.
So the conversion from byte to float works like this:
* NONE -> NON-LINEAR
* SRGB/LINEAR -> LINEAR
...but none change the profile variable.