New client setup details for iCal.

docs/website/clients/iCal-details.php

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+<h1>iCal</h1>
+<p><a href="http://www.apple.com/macosx/features/300.html#ical">iCal</a>, from version 3.0 (released with OS 10.5) is generally well-behaved
+  and will discover your own calendars when configured.  It will not allow you to manipulate other calendars on
+  the same server, however, unless you use different credentials to access them.</p>
+
+<ol>
+  <li>Open the "Preferences" dialog.</li>
+  <li>Choose the "Accounts" tab</li>
+  <li>Click on the "+" and a new panel will appear.</li>
+  <li>Enter a "Description" for the account.</li>
+  <li>The "Username" and "Password" are the relevant ones for your CalDAV server.</li>
+  <li>Open the "Server Options" area and set your account URL to point to http://host.../caldav.php/username/.<img src="clients/iCal-dialog.png" /> <br /> &nbsp;</li>
+  <li>Click "Add" to confirm the new account</li>
+  <li>Your own calendars will be automatically discovered.</li>
+  <li>If you don't already have a calendar for your own user, go to the calendar view and long-click on the "+" will display a menu letting you create a new one.</li>
+</ol>
+
+<h2>Caveats</h2>
+<p>DAViCal does not support the draft scheduling extensions to CalDAV, so you will not see the full functionality
+  of iCal.</p>
+<p>iCal does not let you browse the calendar hierarchy to find other calendars you could view, so you will not
+  see the full functionality of DAViCal either.</p>
+