Allow users to get a blended priority AND raw linkage priority layer.

[johngallo]

From a User in #86 "It would be great to have the corridor priority value return as a default output in addition to blended priority. I thought this is what I would get as an output based on the user guide, but it looks like that disappeared in one of the newer releases. I wanted to see what the straight priority value was and ALSO to see it combined with my linkages rather than having to weight the linkage priority as 1 and blended priority as 0 to get that output. That now requires multiple runs with multiple folders, etc., which is onerous based on the issues I raised above."

Users should have the option of running the model for a few minutes longer to produce the above output. Or, since we are trying to simplify the interface, just do it by default, and if need bee, allow them to turn this off in the advanced settings python file.