fix https://github.com/GerHobbelt/jison/issues/28: restrict both lead, tail and error section of the error area display produced by `lexer.prettyPrintRange()` API to 2 x MINIMUM_VISIBLE_NONEMPTY_LINE_COUNT lines (currently that would be 2x2 = 4 lines) before shortening the middle part of any overlong section to a single line reading '...(continued)...'
fix https://github.com/GerHobbelt/jison/issues/28: restrict both lead, tail and error section of the error area display produced by `lexer.prettyPrintRange()` API to 2 x MINIMUM_VISIBLE_NONEMPTY_LINE_COUNT lines (currently that would be 2x2 = 4 lines) before shortening the middle part of any overlong section to a single line reading '...(continued)...'

GerHobbelt/jison,GerHobbelt/jison,GerHobbelt/jison,GerHobbelt/jison