make minimum combo count configurable

[Google Code Exporter]

in keeping with the spirit of maximum configurability elsewhere in the
game, make the minimum combo count (by default 2, i.e., you have to clear
to separate chunks of viruses to send pieces) configurable

suggest: make this number both limit the amount a client will receive and
the amount a client will send.

Original issue reported on code.google.com by jtolds on 3 Jul 2008 at 5:52