SQLite: Files in ext/fts2/ of a6509ca3dc2602c7

Files in directory ext/fts2 of check-in a6509ca3dc2602c7

fts2.c
fts2.h
fts2_hash.c
fts2_hash.h
fts2_icu.c
fts2_porter.c
fts2_tokenizer.c
fts2_tokenizer.h
fts2_tokenizer1.c
mkfts2amal.tcl
README.tokenizers
README.txt

This folder contains source code to the second full-text search
extension for SQLite.  While the API is the same, this version uses a
substantially different storage schema from fts1, so tables will need
to be rebuilt.