Expand surekh code to cover vedic accents.

[vvasuki]

Namaste!

There is this very valuable vedic text which needs to be transliterated - except the current code does not handle vedic accents (svaras). Can you help fix your code to deal with it? If it helps, here is a related issue (with link to a script and pertinent conversation) from half a year ago - indic-transliteration/indic_transliteration_py#38 .