Manually fixed glyphs in patched Source Code Pro

See issue #4.

The glyphs that were added by fontpatcher.py were not positioned
correctly.  This was most noticable for the triangular separators. To
correct the glyphs I used the following modifications to fontpatcher.py:
- y_ratio *= 0.96
- y_diff += 300

The values are based on trial and error and what "looked" right, so
there is probably still room for improvement.