Hfst

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* Support for default symbol _DEFAULT_SYMBOL_

* A tagger tool hfst-tagger

* Improvements to hfst-lexc

* Removed warning messages and XFAIL tests that may confuse users

* Updated Doxygen documentation.

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* Changes to hfst-proc text formatting

* Containment and term negation added to regexp parser

* Composing intersection supports identity symbols and
inverting the composition

* Introduction of semifunctional pmatch2fst parser

* Function shuffle added under HfstTransducer

* Added the option --print-separator in hfst-fst2strings
to achieve better control of pipelined command line tools

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* All binary tools handle the case where the first input
contains several transducers and the second input exactly
one transducer

* hfst-summarize prints at the end how many transducers it has
read in total, making it easier to work with transducer archives

* hfst-fst2strings bug fixed, now it prints weights with
options --random -w

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* Bugs fixed and new features added to hfst-proc

* Xfst rules tentatively supported in hfst-regexp2fst

* hfst-fst2strings does not produce duplicate paths any more
when using foma as backend

* hfst-lexc implementation format defaults to openfst-tropical
instead of foma

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* Fixes 3.3.7

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* Compatible with OpenFst version 1.3.1

* Identity symbols supported in hfst-regexp2fst