Added more test cases

Added more test cases for ന്റ and റ്റ
[Meera] correct dotrephy1y1 and dotrephv1v1 lookup rules

Signed-off-by: Rajeesh K Nambiar <rajeeshknambiar@gmail.com>
[Meera] half forms were removed in earlier commit, remove them from pres lookup too

Signed-off-by: Rajeesh K Nambiar <rajeeshknambiar@gmail.com>
Reorganize the Makefile

Made the make file more human readable by wrapping around the very long
lines and fonts variable cleaning up. (We don't need quotes around font
list)

Signed-off-by: Vasudev Kamath <kamathvasudev@gmail.com>
Depend install target on compile target.

Previously */*.ttf was declared as the dependency which doesn't exist
and make install will fail.

Signed-off-by: Vasudev Kamath <kamathvasudev@gmail.com>
track version in make file, which can be used to generate tarballs

Signed-off-by: Vasudev Kamath <kamathvasudev@gmail.com>
Target for generating source tarball.

This target generates upstream source tarball which can be used by
downstream distribution. It uses special option of tar so that the
generated tarball content is always owned by root and uses best xz
compression to generate 2mb tarball.

Signed-off-by: Vasudev Kamath <kamathvasudev@gmail.com>
Update the clean target to clear files generated during sdist target running.

Signed-off-by: Vasudev Kamath <kamathvasudev@gmail.com>
Makefile improvements
[RaghuMalayalam] Add dotreph glyph
[RaghuMalayalam] Dotreph glyph cleanup
[RaghuMalayalam] Change the glyph of Malayalam zero
[RaghuMalayalam] Remove experimental Samvruthokaram sign
[RaghuMalayalam] Correct GSUB rules for സ്റ്റ ഴ്ത്ത യ്ക്ക ക്ഷ്മ
[RaghuMalayalam] Use glyph references for zwj based chillus
[Dythui] Update glyphs for o and long o vowel signs with reference glyphs

The glyphs used were not from Dyuthi font. These glyphs are not used anywhere
except for the purpose of illustration inside a font editor
[Dyuthi] Add dotreph glyph
Added ല്ക ല്ക്ക ല്ത്ത  glyphs for consistency

See section Malayalam/Guidelines#Rendering Consistency of
http://thottingal.in/documents/Fontbook.pdf
Added test cases

Test cases to check right cursor positioning after chandrakkala
[Rachana]Adjusted right bearing of chandrakkala

Chandrakkala's right bearing adjusted to zero.