Crop for Olympus E-M1MarkII

[paolodepetrillo]

This is the exact same issue as #480 for the E-M1MarkIII.

The rightmost 32 pixels are affected by an artifact, because the camera does not apply Shading Compensation (vignetting correction) to these pixels.

The raw sensor size is 5240x3912, and the Olympus crop tags specify a 5184x3888 region starting at x=12,y=12. So it first removes the rightmost 32 pixels, then removes 12 pixels from each edge.

A sample showing the artifact is attached.
sample.zip