#3 Patch to make compatible with Qt

[Matt Campbell]

This is just a simple patch so that sigslot.h may be included
with Qt based applications. It consists of replacing all
occurances of connect with connect_slot and all occurances of
emit with emit_signal. Those methods conflicted with Qt's
macro definitions for emit and connect.

This patch will therefore break any existing sigslot code.

[Matt Campbell]

Patched version of sigslot.h