Release 2.0.1

• [TRLC] Fix an UnboundLocalError when missing a term
  in an expression.

• [LRM, TRLC] Add check to detect duplicated components of a record when parsing a TRLC file.
  Below is an example of a *.trlc file demonstrating the new behavior.

  Something duplicated
  {
    description = "This is fine!"
    description = "This is the duplicate."  // will be detected as an error
  }
  

  The Language Reference Manual has been updated accordingly, and its version
  has been increased to 3.1