[patch, fortran] Warn about constant integer divisions

[Thomas Koenig]

Hello world,

the attached patch emits a warning for constant integer division.
While correct according to the standard, I cannot really think
of a legitimate reason why people would want to write 3/5 where
they could have written 0 , so my preference would be to put
this under -Wconversion (like in the attached patch).

However, I am open to discussion on that.  It is easy enough to
change.

Regression-tested.  Opinions?  Comments?  Would somebody rather
have -Wconversion-extra?  OK for trunk?

Regards

	Thomas
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