Updated ImageProcessor to provide a number of merging/blending algorithms.
Enumerated in ImageProcessor.MergeAlgorithm.
Modified ImageProcessor to allow for each instance to have own grey-scale algorithm.
Updated GUI appropriately.
Added and populated net.zeddev.astrostack.gui.dialog package.
Added missing GreyScaleAlgorithmDialog form to source control.
Changed GreyScaleAlgorithmDialog to reusable AlgorithmDialog.
In prep to add merge algorithm dialog.
Fixed AlgorithmDialog.algoModel().
Fixed repo with missing files.
Added dailog to change the merging/blending algorithm for sampling.
Added merge algorithm to FrameGrabber.grabFrames().