Disabling/Enabling CPU and GPU in batch baking options.

[CovaH]

Since it seems like photoscan sometimes benefits from disabling CPUs or the GPU for some parts of the processing it would be nice with a checkbox in the batch rendering dialogs where you can set photoscan to automatically disable the CPU when rendering the dense cloud for example.

[Alexey Pasumansky]

Dear CovaH,

CPU cores slider in the OpenCL tab of PhotoScan Preferences dialog is only applied to the depth maps esitmation step (part of Dense Cloud generation stage), so you do not need to use slider on other processing stages, like Align Photos.