- Bugfix: Crashes when beam size larger than vocab size

- Drop --en_[test|idxmap] and --fr_[test|idxmap] (use src_* and trg_* instead)
- Introduce osm_type
- Change default --beam to 4 and --indexing_scheme to t2t (most common use case)

- Add kenlm predictor

bug fix in parse predictor internal beam

Merge pull request ucam-smt#1 from DCSaunders/syntax

Syntax

- Support reading sentence IDs from a file for more efficient distrib…

…uted decoding

- Remove reset() from the predictor interface

- config_file can be used within config files, and supports comma-

  separated lists of paths

- Compatibility with T2T 1.2.9

Typos

- Rename output_fst_unk_id to fst_unk_id

- Improve UNK handling for fsttok

* Bugfixes in the LRHiero predictor