trying to eliminate ome data types and simplify things a bit.  messing stuff up in the process.
split part of searchTree into an include and exclude function, with intent being to eventually have multiple inclusions.  currently do have multiple exclusions. also changed findPath so it's returning an array not an object, and wrote an expandable test for searchTree
missed a couple on last commit
made it possible to pass exclusions to searchTree either as an array or as individual arguments
commenting import.php to help myself understand