[libvoikko] VFST speller and Sami support for Android

[Harri Pitkänen]

Libvoikko has now a simple VFST speller implementation. Just convert a HFST 
acceptor into VFST format

  hfst-fst2txt -D acceptor.default.hfstol | voikkovfstc -o spl.vfst

and specify "info: Speller-Backend: vfst" in the configuration. Suggestion 
backend should be "none".

With this enabled I got spell checker for Sami working in the Android 
emulator. See this screenshot:

  http://www.puimula.org/htp/tmp/android-sme.png

Spelling suggestions are not supported but other than that it looks quite 
good.

I have not compared VFST and HFST spellers to see if the new VFST speller even 
works correctly with larger test material or how fast it is.

Harri