Version 1.3

This release adds topic diffing, which highlights the modified portion
of channel topics when they are changed. It also adds the /ops command
to list channel operators.

The /help command now doubles up to query the server-side HELP. The
/whois command now understands commas and the two-parameter form.
Formatting codes are now stripped from URLs by the /open and /copy
commands.

This release fixes two line-wrapping bugs relating to formatting and
hyphenated nicks. Messages sent before joining channels are routed to
the correct window again. catgirl now responds to C-c while connecting.