Completes issue #10. Canonical mode follows libyaml's canonical layout
on both the Model and Tagged dump paths (tags explicit, scalars double
quoted, flow one entry per line, anchors and aliases preserved on the
Tagged path). explicitDocumentStart/End wrap the body in --- and ...
markers. lineWidth wraps overflowing flow collections one entry per
line and folds plain block scalars at single-space boundaries, vetoing
any fold that would manufacture syntax, so values always reparse
unchanged.
Closes#10
Mihaela Mihaljevic
8df3f0b8d4