Unit parsing: full names unit, full names with inflections

[kermitt2]

As we moved from "lexical mapping" (not to say rules!) to a CRF parser to process and normalize the unit expressions, the full name unit are not covered by the unit parser, e.g. hours in "2 hours".

[WARN ] org.grobid.core.engines.QuantityParser: Could not normalize the value: 2. 
org.grobid.core.data.normalization.NormalizationException: The unit Unit{rawName='hours', offsets=661   666, productBlock=null} cannot be normalized. It is either not a valid unit or it is not recognized from the available parsers.

[lfoppiano]

Should work now. The only glitch is that the value is normalized in seconds, which is not optimal for huge units, like year/years.

See example:

[lfoppiano]

Now also strange prefix-inflection combination are working in english.

[lfoppiano]

TODO: we need to migrate the lexicon to a json base input file and add support for french and german. (see #14 )

[lfoppiano]

Lexicon has been migrated. We need to add support for french and german (to be check if the notation are not changing between languages)