Connection limits

SVN rev 125:
- Always make 8 outbound connections even if have 8 inbound
- Limit outbound connections to one per a.b.?.? range
- Switch -maxconnections=#

I added the (currently undocumented) switch -maxconnections=#.  You shouldn't use it unless you need to because your router can't maintain a lot of connections, then try -maxconnections=30.

I haven't really tested -maxconnections much, could someone test it?