Illustration, I want to choose both an edition and marked
copyright holder:
```
configuration "inhouse" {
targetType "executable"
versions "InhouseEdition"
}
configuration "salesmen" {
targetType "executable"
versions "SalesmenEdition"
}
configuration "internet" {
targetType
My application has two copyright holders, so I want to be able to
specify in the build command whose copyright marks get compiled
to the program. D part of the application is built by DUB. DUB
configurations would do the trick, but they are already used to
define different editions of the
