Finished first version of conversion tool.
Converter working mostly. Builder doesn't need flux files anymore.
Moved builder met and rxn calculations to utils.

Larger mouse node also, and some style fixes.
New rotate functions...unfinished.
Fixed reaction rotation. Still bugs.
Fixed metabolite rendering.
Improved reaction suggestions in builder
Option to draw beziers; More sensible definition of bezier strength.
Import from simpheny svg's works for label and reaction location.

Next: I need to finish implementing o.scale in the builder drawing code.
Builder conversion improvements

Fixed angle identification in conversion script. Added buttons to hide and show
control points. Also fixed flux rendering for imported builder maps.
Added membranes to the builder.
builder: option for starting reaction
Added code from Niko to parse simpheny dump, and new code to convert to builder json format.
working on builder code for simpheny dump
now displaying nodes and control points from simpheny
builder: metabolite labels are visible
builder: displaying text labels
Fixed node drag-and-drop
draw previous selected node
Added selection brush and selection mode