#78 labelAdjacenyMap bug (at least ltilib-2)

[Peter Doerfler]

The attached tester fails to display the bottom right
pixel in its own color as it should. 4 and 8
neighborhood have different results, but both are wrong.

Tested with ltilib-2, but I don't think there was much
change to this.

[Peter Doerfler]

ltiTester.cpp to reproduce the bug