Cloud-files

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* feat: add cf.move(s), cf.touch methods and cli mv, touch commands (107)
* fix: add drop table stats
* perf: add in stats table for faster xfer performance
* feat: import improvements to ResumableFileSet from transcoder
* fix: release in xfer
* fix: leasing was broken

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* feat: add middleauth+https paths indicate CAVE interface (106)

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* feat: make it possible to normalize e.g. zarr2://./helloworld
* feat: add all current neuroglancer formats to parsing list

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* feat: list for apache servers (104)

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* feat: add size operator to CloudFiles for HTTP interface

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* fix: close unused connections for HTTP interface