[Rachana] Adjust Metrics of Old Style figures. Hopefully better.

Signed-off-by: Rajeesh K Nambiar <rajeeshknambiar@gmail.com>
[Rachana] Move Old Style Zero above baseline, descent 0

Signed-off-by: Rajeesh K Nambiar <rajeeshknambiar@gmail.com>
[Dyuthi] Add dotreph glyph