EM VTLN adaptation

This allows VTLN adaptation within the context of HTS. This code will include the possibility to perform VTLN adaptation as a global warping of the spectrum using base classes and also as multiple warping parameters for different phoneme classes using regression trees (similar to CMLLR adaptation). The code will be incorporated into the mainline HTS distribution (HTS 2.2 beta) from NITech.

The link address is: http://data.cstr.ed.ac.uk/emime/vtln-2011-04_1.0_patch.tar.gz