Adding support for new path specification feature (#17). Can't replace searchDigitalPaths() yet because it does more of a brute-force algorithm. getDigitalPath() could be extended to yield paths using multiple path specifications.
Renaming to be more clear
Changing tags under <musicpaths> tag to be <path> instead of <pref> when saving and also checking that the child tag is a <path> tag when loading.
Adding default path spec to user preferences. This is what should be used when a new path root is added and no release path specification is given.
Renaming musicPaths to pathRoots for clarity.