Add specific passed parameters to functions instead of depending on global variables.

[william-stearns]

, which will have the side effect of removing some global variables. (This may not remove all of them, as many callback functions can't extend the list of params they need.)
pdxlocations, this is a proposed change. Please give a thumbs up, thumbs down, or no preference, and any comments or requests.

[pdxlocations]

I always wanted to do this to make the functions easier to repurpose. The globals were a quick fix to get it working and I never got around to refactoring. Any help here would be appreciated!