If the specified agenda argument is not found in the file system, WA
assumes it is the name of a workload and would then raise an "extension
not found error", which may be confusing if the user's intension was to
specify a path.
Now, WA will first check that neither path separator, nor a '.' are
present in the agenda argument before assuming it is a workload name, and
will provide a less confusing error in that case.
- standardisded on a single context argument
- removed Device.init() no longer necessary as initilize now
automatically gets propagated up the hierarchy. Renamed the existing
use of it to "initilize".
- related pylint cleanup.
