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Add Help topic for remembering password; update CHANGELOG

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+<link rel="stylesheet" type="text/css" href="help.css"/>
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+
+<h2>How do I use the Merge window?</h2>
+
+<p>If you are working with other people on a project, it is likely that
+at some point you'll find that more than one of you have edited the
+same lines in the same file, in different ways.</p>
+
+<p>When that happens and you try to merge the two versions, EasyMercurial
+will pop up a merge window that looks a bit like this.</p>
+
+<p><center><img src="images/merge50.png"></center></p>
+
+<p>(This is actually a separate program, not part of EasyMercurial: it's
+a merge tool called kdiff3.)</p>
+
+<p>This looks a bit complicated, but it is there to help you pick which
+of the changes from each of the two &ldquo;rival&rdquo; versions of the file you
+want to use in your merged version.</p>
+
+<p> <b>The top middle one is <i>your current version</i>.</b> That's
+  the one you had before you decided to merge the other version into
+  it.</p>
+
+<p> <b>At top right is <i>the version you're merging</i>.</b> That's the other
+  rival version &ndash; the one that the other person can see in their copy
+  of the repository.</p>
+
+<p> <b>At top left is <i>the common ancestor</i>.</b> That's the version that both
+  of you had, before you started editing it in different ways.</p>
+
+<p> <b>At the bottom is the output.</b></p>
+
+<p>Each <i>conflict</i> (a line which you have both changed in different ways)
+is shown with <b>Merge Conflict</b> in the output at the bottom.  To sort
+out the conflicts and get the right output, you need to go through
+them one by one, for each one pressing the A, B, or C button to say
+whether for this line you want the top-left, top-middle, or top-right
+version to &ldquo;win&rdquo;.  (You can choose more than one, if you want both
+versions of a line to appear.)</p>
+
+<p>Then having resolved a conflict, press the three-arrows-down toolbar
+button to go to the next one &ndash; and when you've done them all, save
+and exit.</p>
+
+<p>The most important thing to remember is that <i>whatever appears in the
+bottom pane is what you'll get as a result</i>.</p>
+
+<p>No matter how confusing the process, just remember that if it looks
+correct in the bottom pane, it will be correct when you save and
+exit. You can even edit the file directly in the bottom pane if you
+aren't happy with the way the merge is going.</p>
+
+
+
+