[search] improved button for geolocation

(now an actual button)

code/search.js

@@ -8,7 +8,7 @@ addHook('search', function(query) {});
 `query` is an object with the following members:
 - `term` is the term for which the user has searched
 - `confirmed` is a boolean indicating if the user has pressed enter after searching. You should not search online or
-  heavy processing unless the user has confirmed the search term
+  do heavy processing unless the user has confirmed the search term
 - `addResult(result)` can be called to add a result to the query.
 
 `result` may have the following members (`title` is required, as well as one of `position` and `bounds`):

main.js

@@ -84,7 +84,7 @@ document.getElementsByTagName('body')[0].innerHTML = ''
   + '    <div id="playerstat">t</div>'
   + '    <div id="gamestat">&nbsp;loading global control stats</div>'
   + '    <div id="searchwrapper">'
-  + '      <img src="@@INCLUDEIMAGE:images/current-location.png@@"/ title="Current Location" id="buttongeolocation">'
+  + '      <button title="Current location" id="buttongeolocation"><img src="@@INCLUDEIMAGE:images/current-location.png@@" alt="Current location"/></button>'
   + '      <input id="search" placeholder="Search location…" type="search" accesskey="f" title="Search for a place [f]"/>'
   + '    </div>'
   + '    <div id="portaldetails"></div>'

style.css

@@ -511,9 +511,19 @@ input[type="search"], input[type="url"] {
 }
 #buttongeolocation {
   position: absolute;
-  top: 2px;
+  right: 0;
-  right: 2px;
+  top: 0;
-  cursor: pointer;
+  margin: 0;
+  border: 0 none transparent;
+  padding: 0 2px 0 0;
+  height: 100%;
+  background-color: transparent;
+}
+#buttongeolocation:focus {
+  outline: 1px dotted #ffce00;
+}
+#buttongeolocation img {
+  display: block;
 }
 #searchwrapper h3 {
   font-size: 1em;