Added :bmark -id, changed updating semantincs, update URLs in cache, and reported updates as updates rather than additions.

common/locale/en-US/marks.xml

@@ -52,6 +52,10 @@
                 sites that require query parameters in encodings other than
                 UTF-8 (short name <em>-c</em>).
             </dd>
+            <dt>-id</dt>
+            <dd>
+                The numerical ID of a bookmark to update.
+            </dd>
             <dt>-keyword</dt>
             <dd>
                 A keyword which may be used to open the bookmark via
@@ -88,7 +92,7 @@
         <p>
             If <oa>!</oa> is present, a new bookmark is always
             added. Otherwise, the first bookmark matching
-            <oa>url</oa> is updated.
+            <oa>id</oa>, <oa>keyword</oa>, or <oa>url</oa> is updated.
         </p>
     </description>
 </item>

common/locale/en-US/messages.properties

@@ -33,10 +33,12 @@ bookmark.noMatching-2 = No bookmarks matching tags %S and string %S
 bookmark.noMatchingTags-1 = No bookmarks matching tags %S
 bookmark.noMatchingString-1 = No bookmarks matching string %S
 bookmark.none = No bookmarks set
+bookmark.bangOrID = Only one of ! or -id may be given
 bookmark.cantAdd-1 = Could not add bookmark %S
 bookmark.allDeleted = All bookmarks deleted
 bookmark.removed-1 = Removed bookmark: %S
 bookmark.added-1 = Added bookmark: %S
+bookmark.updated-1 = Updated bookmark: %S
 bookmark.deleted-1 = %S bookmark(s) deleted
 bookmark.prompt.deleteAll = This will delete all bookmarks. Would you like to continue? (yes/[no]):