handNote: constraints, type attribute value recommendations

[mjhawkins]

hanNote contains several changes in the current consolidated schema.

The script attribute recommends the following values. Are they all OK to include in the base schema or do we want to remove them, change some, add some more?

• capitalsRustic
• capitalsSquare
• cursiva
• cursivaAntiquior
• gothicoAntiqua
• halfUncial
• humanistica
• humanisticaCursiva
• humanisticaSemitextualis
• humanisticaTextualis
• hybrida
• minuscule
• minusculeCaroline
• minusculeInsular
• minusculeVernacular
• protogothic
• semitextualis
• textualisNorthern
• textualisSouthern
• uncial