cluster suggestion (generic cluster support)

[Rachel Llorenna]

Since most cluster_* functions are nearly identical, wouldn't it be
more efficient to create a single, more generic function that could
handle all cluster types? I believe ircd-ratbox does this. At the very
least, it would reduce the amount of code required while not adversely
affecting the performance of ircd-hybrid. This would also make it
easier to implement new cluster types.
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Regards,

Rachel Llorenna (frequency)