[libvoikko] Introducing VFSTs (Varissuo Finite State Transducers)

[Sam Hardwick]

Very interesting! I'd be interested in hearing more about VFST, sounds 
very useful.

Two things:

1) Does the VFST lookup do result caching? That's known to give a big 
speed boost.

2) 80.4 s for 80 000 words sounds slow for hfst-optimized-lookup, even 
with OmorFi. There's probably something a bit off here.

Sam Hardwick