Use jflex-scala for lexing#59

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ANogin wants to merge 2 commits intoLS-Lab:masterfrom

HRL-AA-ExACT:jflex

Commits on Aug 22, 2019

Use jflex-scala for lexing.
Aleksey Nogin
committed
Fix minor bug in jflex-based lexer, improve error reporting
Aleksey Nogin
committed