confRev should be incremented above 0 when a DataSet is connected to a Control Block

[danyill]

The standard says:

• The confRev value 0 is only allowed for newly created control blocks without data set
reference. For any change of the data set structure or the data set reference, inclusive
removal of this, confRev shall be incremented.

We should increment it by 10,000 as required elsewhere in IEC 61850-6.

We noticed this with SEL relays which will not load to subscribing devices for GOOSE if the publishing device has configuration revision of 0.

[danyill]

Additionally, once a DataSet is connected, a validity check should be done on the confRev such that if it is zero it represents an error.