Add new GREL function to normalize characters about openrefine HOT 1 OPEN

A normalize() function which parallels the existing fingerprint() function would be useful to allow access to the algorithm that fingerprint uses internally, but we probably want to include some other algorithms as well, such as the four Unicode normalization forms. The java.text.Normalizer class provides access to this functionality.

Separately, we probably also want to enable access to locale sensitive string comparisons of various strengths as provided by java.text.Collator. The associated CollationKeys aren't really usable directly by themselves except for collating and testing whether two strings are equivalent at a given strength (e.g. for Western European languages, tertiary = ignore strength, secondary = ignore diacritics). Because this needs to have a locale specified, it probably needs a separate function, since normalize() is locale independent.

from openrefine.