Merge pull request #1 from Elizacat/master

Add USERHOST
Stylistic changes to m_userhost
Add QUIT (finally!)
Rename u_user{quit => unlink}

u_user_unlink is less confusing. The user is being "unlinked" from
the typical IRC data structures, even though no memory is actually
freed. (Memory is freed when the connection object is destroyed.)
Merge http://github.com/aji/ircd-micro

Conflicts:
	src/c_user.c