convert-repo: add some smarts autodetect source and destination repo types autodetect read and write capabilities of converters default destination directory (<src>-hg) default map file (<dest>/.hg/shamap) more verbose by default add a -q switch add IO functions

<table class="slogEntry parity#parity#">
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  <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>