All neume head shapes

programmed in all of the neume head shape changes, complete with an
interface dropdown to select a specific neume head shape.
Saint Gallen quilisma drawing

added SVG for staffless quilisma neume. The quilisma neume can now be
drawn using the head shape change interface option.
Staffless neume remove pitch attrs

Do not write pname="" and oct="" for staffless neumes where this is no
pitch attributes to store.