[openbeos] ShowImage "Mirror" Operations

I was testing out ShowImage and I feel that the Mirror Horizontal and
Mirror Vertical operations are somewhat confusing. I expected them to
work opposite to how they did, but after some thought it made sense.

My suggestion would be to rename them to Flip Vertically and Flip
Horizontally, which I am use to from the GIMP (and I assume Photoshop
has similar operations.) Flip Vertically would be the same as Mirror
Horizontal, and Flip Horizontally would be the same as Mirror
Vertical.

Does this idea seem reasonable? If I was confused, others may be as well.

I am totally willing to make this change as my first contribution to
the project, if no one has any objections.

Ryan

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