genlang: More voice-related fixes.
* Use consistent ID numbering
* Use consistent logic for voicelist and voicebin files
* Fix situations where English <-> English would fail in strange ways
* Delete leftover tmpfile.
* Off-by-one error in voice validation code
* Off-by-one error in voicelist generation
Change-Id: Ib3cea2c6612138b1cbe614dacbe51000199cc9ad