New plugin for applying LUTs

[Gabriel Landini]

Hi,
I updated the List_LUTs plugin and created a new one that allows to use the
stack created with the former to apply the corresponding LUT to any greyscale
image.

To use these, the LUTs should be stored in a folder ImageJ/plugins/Color/LUTs

Run the List_LUTs plugin, navigate the folders and select any LUT file. This
will create a stack. Save the Stack.tif in the same LUTs folder.

Then run the LUTs plugin and this should use the saved stack to produce a
panel where one can browse the LUTs and select to which images the LUT is
applied.

http://www.dentistry.bham.ac.uk/landinig/software/lut/lut.html

Thanks to Wayne for resolving a bug and suggesting some improvements.

Please let me know of any problems.
Cheers,

Gabriel