Add FORTRAN and Forth samples.

samples/FORTRAN/sample1.F

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+c comment
+* comment
+
+      program main
+
+      end
+
+      subroutine foo( i, x, b )
+      INTEGER            i
+      REAL               x
+      LOGICAL            b
+
+      if( i.ne.0 ) then
+         call bar( -i )
+      end if
+
+      return
+      end
+
+      double complex function baz()
+
+      baz = (0.0d0,0.0d0)
+
+      return 
+      end