[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>
Add more tests for numbers
[Meera] Latin glyphs improvement

* Corrected LBearing and RBearing to uniform values 160, 0
* Introduced kerning for latin glyphs
Merge branch 'mlm2' of ssh://git.sv.gnu.org/srv/git/smc/fonts into mlm2