Test RawTherapee 5.6-rc1

[paulmiller]

@HIRAM, @Hombre:

Here are the results for g7d33fc40:

With Pseudo-HiDPI mode off:

With Pseudo-HiDPI mode on:

I think it looks better with Pseudo-HiDPI mode off, the graphics are not any less sharp, and the UI is the right size.