contexts: add working dir and working file contexts
add workingctx
add workingfilectx
extend filectx.annotate for rev=None
extend filectx.ancestor
<table class="slogEntry parity#parity#">
<tr>
<td class="age">#date|age#</td>
<td class="author">#author|obfuscate#</td>
<td class="node"><a href="?cs=#node|short#">#desc|strip|firstline|escape#</a></td>
</tr>
</table>