Revert "[Rachana]Added GPOS anchor to dotreph"

This reverts commit 294de54a760d5744bf996ccfaedaab07a2c3e7ea.
We shall cherry-pick d66491c4b9f44 from mlm2 branch instead.
Revert "[Rachana] Renamed anuswara to anusvara"

This reverts commit f656d5b762a10d276543d8bc4d20fb9330da694d.

Conflicts:
	Rachana/Rachana.sfd
[Rachana] Use GPOS 'abvm' for Dotreph. Removed 'akhn' glyphs for the same.
A full days of work inspecting entire glyphs and positioning, well worth it though.

Signed-off-by: Rajeesh K Nambiar <rajeeshknambiar@gmail.com>
[Rachana] Renamed anuswara to anusvara (and renumber lookups)

As per unicode naming scheme ം is renamed as anusvara
Author: Kavya Manohar <sakhi.kavya@gmail.com>
[Rachana] Adjust dotreph position for some glyphs

Signed-off-by: Rajeesh K Nambiar <rajeeshknambiar@gmail.com>
[Meera,Rachana] Release 5.1.0-RC

Signed-off-by: Rajeesh K Nambiar <rajeeshknambiar@gmail.com>
[Rachana] Dotreph Right Bearing adjustment

Right bearing of dotreph was adjusted to zero.