CP1: Bug: unison not detected

[rualark]

[rualark]

Cause: when aslur is set, unison at previous step is not checked. This means that slur start can have unison, which is wrong. Not checking unison at slur end is also wrong. Only thing that should not be checked at slur end is:

• Perfect consonance parallel (actually impossible)
• Perfect consonance direct (actually impossible)
• Perfect consonance combinatory (possible with octave leap)
• Perfect consonance different (possible)
• Dissonance (possible)
• Perfect consonance downbeat
• Perfect consonance culmination
• Long parallel imperfect consonance (actually impossible)