[FEAT] new scenario type multitest
[FEAT] new scenario type multitest

To describe a whole testrun in a file, you had to use either testplans
or interdep scenarios with just one element. Both bring additional
features that may be unwanted and don't work nicely with autorerun.

Now you can describe testruns as multitest scenarios. This mirrors the
multitest behaviour of testplans without all the testplan extensions.

tapper/Tapper-Cmd,tapper/Tapper-Cmd