OcrTrainer didn't compile...
Change of the control of Camera activity.  It is now started directly by
the Main activity, and the Main activity relays the shot picture to
Capture activity.
Device rotation code.

The recognition of the puzzle worked as intended, but the preview image
was not in a right orientation...  I didn't thought that.
Redone the device rotation.
Removed debug text from the layout for capture activity.
Camera preview has a correct aspect ratio even if the preview
size and the physical screen size are different.
Reorganized CameraActivity timings that some key events happen.
The issue on OpenCV initialization delay (and related forced install
issue) is not solved yet.