train tagger tagset option, v3 specific test script

--HG--
branch : py3
train tagger tests with PYTHONHASHSEED=0

--HG--
branch : py3
analyze tagged corpus v3 tests

--HG--
branch : py3
analyze tagger coverage v3

--HG--
branch : py3
analyze chunked corpus works for v3

--HG--
branch : py3
analyze chunker coverage working for v3

--HG--
branch : py3
train chunker default filename fix

--HG--
branch : py3