push: feed pushoperation object to _pushbookmark function
This will able the bookmark synchronisation to have full information on the
ongoing push and pass information to other operation.
{header}
<title>Mercurial repository not found</title>
</head>
<body>
<h2>Mercurial repository not found</h2>
The specified repository "{repo|escape}" is unknown, sorry.
Please go back to the <a href="{url|urlescape}">main repository list page</a>.
{footer}