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Fix #111

this is a new object to handle multiple place for the same library (for
example if a library is bundled in a platform and installed in the
sketchbook).

- removed a lot of redundant code (especially in install/uninstall/list)
- some operations should be reimplemented using the generic functions
  in the `arduino/libraries` module.
- improved output of `lib list` command
- improved indexer

Fix #145