added the ability to invert values in the buffer.

mostly as an exercise to learn Qt and C++. In some cases I wonder if
data isn't being stored in the inverse on occassion, since default
value of raw nand is FF?
add histogramming and top value reporting
Merge branch 'master' of git://github.com/bunnie/nandsee

A bit of an ugly merge.

Conflicts:
	nandseewindow.ui
add more detailed entropy calculations
remove entropy.h, it's not needed
histogramview: Move histogram stuff to its own view
Merge branch 'master' of git://github.com/bunnie/nandsee

Conflicts:
	nandsee.pro
	nandseewindow.cpp
	nandseewindow.h
	nandseewindow.ui
nandseewindow: Fix changes to nandseewindow