Initial IRC server commit.

. miniircd fresh code without Xsocket APIs.
Xsocket modifications to miniircd.
Initial commit of sic (IRC client).
Remove sic binary.
Register IRC service.

. Use Xregister to register dag.
. Fix wrong usage of Xsend, Xrecv.
sic: Migrate from FILE to Xsocket API.

. TODO: Line-wise reading of server replies.
sic: Line processing.

. Remove debug logs.
. Line-wise processing of client reads.
Doc formatting.
Plug-in irc to applications build.

- Build clean up. Remove symlinks and follow other app build process.
- Remove sic compilation warning.
Merge pull request #38 from shoban/irc-chat

Merging in sample IRC chat application from shoban