__init__.py:
- fixed voiceleading for 'byBeat'
- fixed score construction for multi-part scores
- now rests are included in scores

musicNetServer.py:
- fixed measure range reporting
__init__.py:
- harmonic intervals are now absolute
- documented problem of symmetrical queries

musicNetServer.py:
- removed part ordering constraints
__init.py__:
- fixed handling of Spanner, Chord, and Voice import
- moved 'voice' from node property to (temporary) vertex property
- vertex can now exist before _addNode() is called
- added 'distinct' option to Query._assemblePattern()

musicNetServer.py:
- added 'distinct' option to pattern construction.
- switched to py2neo 1.6
- fixed _signedModulo
- switched from in-memory to sqlite3 node storage (NodeFarm class)