Fix bugs; better handle oplevels from ircu2.10.12

Fix bugs; better handle oplevels from ircu2.10.12

* Fix order of port and IP in sample socks4 proxy test.

* Fix a bug in dict_remove2() that corrupted the tree order if a
cleanup function tried to delete another node.

* Fix a buffer overflow in cmd_joiner.

* Get rid of free_nick_info() since it is really just free().

* If our P10 uplink sends an oplevel in a burst, treat it as a chanop.
git-archimport-id: srvx@srvx.net--2004-srvx/srvx--devo--1.3--patch-78