The lexer now tracks the data that has been read since the start of the
current line. While this may have use in parsers, the immediate use is
by the common error reporting procedure.
The `common#error` procedure already reports the column and line number
where an error occurs. The `common#expect` function is broadly used by
parsers and generates the majority of parser errors. It now uses the
lexer's record of the current line to format its error message with a
direct pointer to the location of the unmet expectation.
- newVC3_Tel was not assigning the value provided to the constructed
object.
- Private unit tests were run every time the code was compiled due to
how the unittest library works. These now only run as part of the unit
tests with `nimble test`.
