Issue with preprocessor includes/normal includes

Hi,

Bothering you again with preprocessor things. With these files `foo.F90`:

``` fortran
function A
#include "bar.f90"
```

and `bar.f90`

``` fortran
function B
```

FORD will correctly parse both files via the proprocessor include. However, in the documentation for function B, if I click to view the source, only `foo.F90` is there, with the preprocessor macro unexpanded. Is this the desired output?

If i use `include "bar.f90"` instead of `#include "bar.f90"` the joined file will be shown by FORD.

Related issue: when using MPI I frequenctly need to add a line

``` fortran
include "mpif.h"
```

to the source. This causes FORD to not be very happy. Is there an easy way to add a

``` fortran
include "mpif.h" ! FORD_please_ignore_this
```

or equivalent thing? Sorry about joining questions, but they are sort of the same thing.