On `use different styles concurrently`

First of all, Stefano and everyone suppporting here, I think you are doing a great job, I think this sort of effort has long been missing in the FORTRAN community. Wanted to get that out of the way first.

Here's something I noticed in the current README:

> use different styles concurrently

-- if you mix camel case and underscore style in a case insensitive language, doesn't that mean that the compiler gets confused as soon as you have single word modules / types? If that assumption is correct I'd advocate against doing this mix.