Minor bug fixes

Fixed a few lines of code which only compared duration strings against the whole/half note aliases `"w"` and `"h"`. Now these lines compare against `"1"` and `"2"` where necessary.  This fixes a bug where articulations are incorrectly rendered when attached to whole notes initialized with a duration string of `"1"` instead of `"w"`

Fixed a small bug with the 128th note rest glyph properties. Previously the upper bound was not quite right so the bounding box was a little off.