Currently Chipyard is including `barstools.iocell` as a separate project
from the rest of barstools, and it does this by creating a new project
rooted at `src` with its source directory rooted at
`src/main/scala/barstools/iocell`. This causes problems for IDEs like
IntelliJ which do not support having one source root from one project
nested inside another source root from a different project.
By breaking out `barstools.iocell` into a separate project root, this
should cause IDEs and similar tools to better understand the project
structure, and makes it so that `iocell` is not in two projects at the
same time.
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