[indic] Displaying indic vowel sign independant of a consonant

[cibu cj]

Once in a while I get the request to display vowel sign or anuswara
sign independent of any consonant. My understanding was that
<non-breaking-space, combining mark> will do the trick. Apparently, that
does not in Windows XP where I tried. The dotted circle is always there. Is
this a bug or lack of specs?

Also, there is need for writing indic combining marks independent without a
space before it. Please see this dictionary
scan<http://cibucj.googlepages.com/malayalam-standalone-vowel-sign.PNG>.
The highlighted cluster is <Malayalam U, en dash, Malayalam anuswara>.

Thanks,
Cibu
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