Rewrite the JOIN channel logic, dropping MaxJoins

Instead we fill the JOIN line up with as many channels as we can fit in
an IRC line. Rate limiting is done per command now, making MaxJoins
unnecessary.

modules/data/webadmin/tmpl/add_edit_user.tmpl

@@ -223,10 +223,6 @@
 					<div class="inputlabel">Join Tries:</div>
 					<div><input type="number" name="jointries" value="<? VAR JoinTries ?>" class="third" min="0" /></div>
 				</div>
-				<div class="subsection">
-					<div class="inputlabel">Max Joins:</div>
-					<div><input type="number" name="maxjoins" value="<? VAR MaxJoins ?>" class="third" min="0" /></div>
-				</div>
 				<div class="subsection half">
 					<div class="inputlabel">CTCP Replies:</div>
 					<div><textarea name="ctcpreplies" cols="70" rows="3"><? LOOP CTCPLoop ?><? VAR CTCP ?>