deleted unused code
partial functionality

dragging only works for previously-drawn vector
dragging works only for specific bearings

dragging works for any previously-drawn vector that has a bearing
between 0 and PI/2
All vectors draggable

other vectors not correctly deselected
Vectors drag correctly

with selection/deselction
debugging text commented out

vector dragging working correctly
final cleanup for this branch

a few commented-out lines of code deleted.
Merge pull request #2 from Cheddles/vectorDragging

Vector dragging