Implement config reading functions and a minimal command line client for using them.

Yes, I hate oversized commits too, but this is hard to avoid sometimes.

Adjustments to the Session functions logic required to make it work:
 Do not try to validate the path. The validation function is geared towards
  validating _set_ paths, so when path lacks a value, it doesn't work right.
  We assume that the path has been through set at some point, so if a path
  currently exists in the config tree, it is also a valid path that can be used for
  Reference_tree.is_leaf etc.

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