DAQmx adding RSE Ch (0) to existing Diff paired Ch (8) should give Warning

[Steve_TDiode]

Attempting to add a channel (Ch8) to an existing task which already uses that channel as a result of having already assigned its paired differential channel (Ch0) results in that channel correctly not being added to the task but also does not generate a warning or error.  Thus when attempting to configure a task with 2 channels as Ch0 differential and Ch8 RSE, the resulting task only contains 1 channel.  This may be not be apparent because the channels 0 and 8 appear as different from each other.  Having a warning could give notification of this fact. 

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