Improve handling of tall consonants and vowel AM.
Improve handling of tall consonants and vowel AM.

xmirror/m17n-db,sanskrit-coders/m17n-db,xmirror/m17n-db,sanskrit-coders/m17n-db,xmirror/m17n-db,xmirror/m17n-db,sanskrit-coders/m17n-db