Feature request: documentation for list of variables

Given Fortran's style of variable declaration, it is common to see (and write) variable or, more importantly, dummy argument declarations as

```fortran
REAL(8), DIMENSION(:) :: X, Y, Z
```

Right now to document `X`, `Y` and `Z` I need to repeat `REAL(8), DIMENSION(:)` part as in

```fortran
REAL(8), DIMENSION(:) :: X
!! X docs
REAL(8), DIMENSION(:) :: Y
!! Y docs
REAL(8), DIMENSION(:) :: Z
!! Z docs
```

I would like to have it a bit more like in Doxygen with, say `param:` tag (at least for dummy arguments):

```fortran
REAL(8), DIMENSION(:) :: X, Y, Z
!! param: X Docs for X
!! param: Y Docs for Y
!! param: Z Docs for Z
```

I am not sure if that kind of tag is possible though.

Similarly, for fields in `TYPE` declaration (BTW, Doxygen cannot do this):

```fortran
TYPE FOO
REAL(8) :: X, Y, Z
!! param: X Doc for X
!! ....
END TYPE
```