jar: invoke scaladoc;

tuned comments; simplified symbol pattern presentation: no need to keep source strings, canonical ofString does the job; auxiliary class Recoder; proper implementation of Interpretation.decode/encode;

use scala.collection.jcl.HashMap, which seems to be more efficient; char_pattern: proper matching of surrogate unicode characters, those outside the Basic Multilingual Plane; class Interpretation: misc reorganization, more serious preparation of patterns and tables;