nanshe/advanced_image_processing.py: Added logging messages for entering and exiting the watershed segmentation portion of wavelet_denoising.
nanshe_viewer: Created a mechanism that provides an operator for max projection onto a source. Added MaxProjectionConstantSource and MaxProjectionConstantRequest for dealing with determing the max projection of a constant source (will not change or become dirty) along one dimension.
nanshe_viewer: A temporary solution for max projection objects to cache results on initialization.