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This resolves #113 (closed). Currently only LOCAL DATA section is implemented for now, I'll implement PARAMETERS later, you can review and test the code in the meantime.

Example:

DATA:
  x is number
PROCEDURE:
  sub-procedure foo
    LOCAL DATA:
      i is number
    PROCEDURE:
      incr i
      display "FOO " i crlf
  end sub-procedure
  sub-procedure bar
    LOCAL DATA:
      i is text
    PROCEDURE:
       join i and "-" in i
      display "BAR " i crlf
  end sub-procedure
  for x from 0 to 10 step 1 do
    call foo
    call bar
  repeat

Output:

FOO 1
BAR -
FOO 2
BAR --
FOO 3
BAR ---
FOO 4
BAR ----
FOO 5
BAR -----
FOO 6
BAR ------
FOO 7
BAR -------
FOO 8
BAR --------
FOO 9
BAR ---------
FOO 10
BAR ----------

All the variable declaration statements where merged to only one if to reduce duplicated code.

We store in which subprocedure a variable was declared and when we expect some variable we search it in the current subprocedure and main variables. The function variable_type handles this.

To keep the variable values persistent, we fix the C++ identifier based on the subprocedure (for example, LVAR_SUBPR_FOO_VAR_I) and declare it as a global variable.

The PROCEDURE: label is optional if the subprocedure only has procedure statements. This was implemented with the in_procedure_section function.