Need for some more references test cases in UTRRS

[Pravin Satpute]

Hi,

   I have some suggestion based on 
https://bugzilla.redhat.com/show_bug.cgi?id=825081 for Kannada script. 
I observed in Kannada script after applying vowels U, UU significant
change happens in overall rendering.

    We need some guideline. Since at one hand we have limitation for not
adding x*x combinations and same time we have to add all those
combination creating confusion to developers.

   Proposed guideline: Add <cons+haln+cons+matra> under condition when
applying <matra> to <cons+haln+cons> combination create signification
difference/variance than applying <matra> applied to single <cons>.

Regards,
Pravin Satpute