Change name and comment for Cluster::m_nSynapticTransDelay; fix its initialization

[stiber]

What kind of issue is this?

• Bug report
• Feature request
• Question not answered in documentation
• Cleanup needed

The static variable m_nSynapticTransDelay is actually the minimum synaptic transmission delay. It is the number of time steps that spikes can be buffered within a cluster before they need to be sent to their destinations in other clusters.

Besides name and comment, right now its value is hard-coded. It should be initialized based on the synaptic delay information for the current models.

        /**
         * The synaptic transmission delay, descretized into time steps
         */
        static int m_nSynapticTransDelay;

What is affected by this?

How do we replicate the issue/how would it work?

Expected behavior (i.e. solution or outline of what it would look like)

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