as deprecated on compilers that support it.
overflowing the client exiting server notice (from TOPICLEN to 260). kill reasons become shorter accordingly. kline/dline/gline reasons become 390. away messages stay at TOPICLEN for now.
+ branches/release-2.1 -> 2.2 base + 3.0 -> branches/cxxconversion + backport some immediate 3.0 functionality for 2.2 + other stuff