Track out variables and function results

[chovyy]

Let's say there is a global variable exmpl and code like this:

alias => exmpl
result = alias%var1 + 42

In this situation FCG knows that exampl%var1 is used in the code, but if it looks like that

FUNCTION func()
  ...
  func = exmpl
END FUNCTION

alias => func()
result = alias%var1 + 42

or

SUBROUTINE subr(outVar)
  ...
  outVar = exmpl
END SUBROUTINE

CALL subr(alias)
result = alias%var1 + 42

it currently doesn't work correctly.

[chovyy]

Fixed by v1.3.0.