Global model identifier

So, setup is next:

• You have Daya Bay model A, version v0c
• You have Daya Bay model B, version v0c
• Both models have the same labels
• If we try to connect two same models, we couldn't recognize A/B model immediately
• Of course, it is possible to understand which model is which by order of connected inputs, but it takes time

My suggestion is to add an extra global prefix/name of model that can be used to update model labels. This is not a critical issue, but we may take it into account

from comment of #5.