Accept absolute root directories in the file server #558
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Closes #557.
Also some refactors:
path
utility functions are used where appropriate.filePath
/dirPath
is an absolute FS path to a file or directory, whereasfileUrl
/dirUrl
is a syntactically absolute path but relative to the served root, consistent withreq.url
. The latter were confusingly calledfileName
/dirName
before.