Flycheck DMD Coverage and Dscanner Support

[Nordlöw via Digitalmars-d-announce]

I've added experimental support in Flycheck for highlighting all 
lines that have zero coverage at

https://github.com/nordlow/elisp/blob/master/mine/flycheck-d-all.el

Source is an extension of unittest add-ons in 
https://github.com/flycheck/flycheck-d-unittest.

I've also had Flycheck-support for Dscanner hanging around for 
some time at

https://github.com/nordlow/elisp/blob/master/mine/flycheck-d-dscanner.el

I haven't figured out how to have these active at once, thought. 
So pick one or the other but not both at the same time. Something 
wrong with my settings of the `:next-checkers` property I 
presume. Ideas?

Feedback is much appreciated. A key-question is how the coverage 
line count could be visualized aswell.

Destroy!