Fix various typos in Devanagari diacritic signs

[DavidHaslam]

A bespoke TextPipe filter was designed to perform the following changes:

• Replace any multiple Candrabindu by a single Candrabindu
• Replace any multiple Anusvara by a single Anusvara
• Replace any multiple Visarga by a single Visarga
• Replace any multiple Nukta by a single Nukta
• Replace any multiple Virama by a single Virama
• Move the Nukta to before a preceding vowel or Virama sign

The attached log file lists how many changes were made in each file. textpipe.log

Notes:

1. My filter was extended to cover multiples of each sign, but in fact there were doubles found only for the Anusvara and the Nukta signs.
2. The Nukta sign (in effect) converts a letter to a composite letter, so the sign placement is ideally immediately after the letter rather than after a vowel or Virama sign attached to the same letter.
3. Due to the way smart fonts display Devanagari, many of these fixes will seem not to be a visible change.

[DavidHaslam]

Please review. @joshykurian Thanks.

[DavidHaslam]

Thanks, @joshykurian