fixed documentation
bugfix to vil_stretch_image_process.cxx

bugfix to ensure the src image is not modified if it is already of type float
unreachable return statement
Added option to bypass sanity checks on atmospheric parameters

This option is useful if the image metadata is bad or non-existant. In
this case, the atmospheric parameters may not correspond to physically
meaningful values, but that may okay depending on what you're using them
for.
fixed typo in input initialization
Updates to view based appearance modeling.