Well, I feel good (for me, not for you) that the horizontal crack by the sliding glass door starts right at the top of the rough opening, as I suspected. I'll admit that I expected it to go straight over, not down some more and then over, but it ends up right where I expected it would.
This may mean that they did not correctly supported the structure when they moved the door. Seeing the position, condition and support for the header that should run across the entire top of the door would be interesting.
I'm assuming they moved the door to the right as you look at it from the inside. That might have left part of the header "cantilevered" to the left of the new opening. Maybe they didn't add enough support under that cantilever and it is now sagging. I say that because of your mention of the door being moved 2 feet. The vertical crack that starts at the ceiling seems to be about 2 feet from the door, right about where the original header would extend to. Then it runs horizontally, perhaps along the top of the header, then downward before it goes horizontal again perhaps along the bottom of the header. I'm visualizing a 2 foot section header in the area below the horizontal crack.
On the other hand, perhaps that wall is structurally fine and the wall cracks are just superficial stress cracks of the plaster itself. (it is plaster, not drywall, correct?)
In any case, good luck!