Issue #37: work out TDFileSystemDirectoryNode rendering ... push TDShellAbstractStonCommandTests root path handling to satisfy disk-based object paths ... checkpoint as I have to consider best way to represent object structure on disk ... would like to `cd <path>` where a "directory" will have a bunch of TDNodes serialized to disk and I;d like it to look like a regular TDDirectoryNode with children ... so will probably at `.ston` extension on files and meatrialize `.ston` files when encountered on disk via object shell interaction ... time for some experiments...
Issue #37: TDShellFileSystemStonCommandTests>>testRsync passes ... "transparent" access to disk-based objects (.ston files) ... oh and rsync objcts from disk to disk ...
slice off Topez-Server-Obsolete which contains TDLeafNodeBuilder and friends ... suspected to be obsolete (no refs) but want to do a two stage delete
Issue #37: obsoelete TDLeafNodeBuilder and friends ... settled on elementSource and elementSource: as getter/setter api from the editor side of the house .... TDPluggableLeafNode needs some work to be a faithful wrapper for arbitrary leafNodes as needed to wrap leaf nodes stored on file system...
Issue #37: fleshed out TDPluggableLeafNode to act as a leaf node proxy for TDFileSystemLeafNode proxy saves edits to disk ... no proxy for directory node because of challenge of saving changes ... so we'll simply splice the directory node into the structure
Issue #37: TDShellFileSystemStonCommandTests finally tests (using TDPluggableLeafNode), but I am unhappy with the hacks it took to get TDPluggableLeafNode working ... I should build a TDProxyLeafNode ... I don't think that TDPluggableLeafNode should survive ...
Issue #37: TDShellFileSystemStonCommandTests tests passing using TDProxyLeafNode
Issue #37: rename/refactor TDShellAbstractStonCommandTests hierarchy in preparation for testing four combos:

  - obj to obj
  - fs to fs
  - obj to fs
  - fs to obj
Issue #37: tweak before major test migration
Issue #37: rsync checksum tests migrated
Issue #37: rsync recurse tests migrated ... TDShellFsToFsStonCommandTests test don't pass, but that's because of bug in the way rsync is implemented for file system nodes...
Issue #37: TDShellFsToFsStonCommandTests tests pass
Issue #37: `rsync rsync --recursive --relative` TDShellFsToFsStonCommandTests tests pass
Issue #37: `rsync rsync --recursive --relative` TDShellFsToFsStonCommandTests tests pass .. full path and relative path source...
Issue #37: `use #beRounded DateAndTimes ... avoid SmallDouble serialization impreciseness ... TDShellFsToFsStonCommandTests are green