Add the possibility to include tests in a group and not only at the root

[Seddryck]

Currently, the action suite include or suite addrange don't support to redirect the test to a specific group, they are always redirected to the root. It should be possible to do it.

suite include file 'myFile.nbitx' into 'dimension|hierarchy';

At the opposite of generate, the group's name cannot be based on a template because this action is not linked to the cases.

[Seddryck]

available in 1.21.0-alpha.1+267 or at https://ci.appveyor.com/project/Seddryck/nbi/builds/26570459/artifacts