Simplify the job tree
At the moment the job tree is like a normal tree without any restrictions while nobody needs this actually. We discussed that the job tree should have the same structure as preset jobs (corresponding jobs are virtual) and users should be able to create concrete jobs just on the base of these virtual jobs. The only exception is that users should be able to create unique virtual jobs at the first nesting level. These virtual jobs will allow to group several similar jobs together.
After all there will be no complex hierarchies of jobs that nobody cares on and that are hard to synchronize between various instances of Bridge. All operations will be simpler as of now.